diff --git a/01-project-introduction.html b/01-project-introduction.html
index 147803c..b318945 100644
--- a/01-project-introduction.html
+++ b/01-project-introduction.html
@@ -368,7 +368,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Introduction to R and RStudio</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/01-project-introduction.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -776,8 +776,8 @@ <h3 id="version-control">Version Control<a class="anchor" aria-label="anchor" hr
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/01-project-introduction.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/01-project-introduction.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/02-data-visualisation.html b/02-data-visualisation.html
index 7df1176..affa7dc 100644
--- a/02-data-visualisation.html
+++ b/02-data-visualisation.html
@@ -364,7 +364,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Visualisation with ggplot2</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/02-data-visualisation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -576,7 +576,7 @@ <h3 class="callout-title">Challenge 1a</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint1" aria-expanded="false" aria-controls="collapseHint1">
   <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
 <div class="accordion-body">
 <p>The* <code>penguins</code> *dataset has a column called
 <code>year</code>, which should appear on the x-axis.</p>
@@ -589,7 +589,7 @@ <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb4">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -624,7 +624,7 @@ <h3 class="callout-title">Challenge 1b</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -679,7 +679,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -784,7 +784,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint2" aria-expanded="false" aria-controls="collapseHint2">
   <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 </button>
-<div id="collapseHint2" class="accordion-collapse collapse" aria-labelledby="headingHint2" data-bs-parent="#accordionHint2">
+<div id="collapseHint2" class="accordion-collapse collapse" data-bs-parent="#accordionHint2" aria-labelledby="headingHint2">
 <div class="accordion-body">
 <p><code>alpha</code> takes a value from 0 (transparent) to 1
 (solid).</p>
@@ -797,7 +797,7 @@ <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -832,7 +832,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -966,7 +966,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb17">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1014,7 +1014,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint3" aria-expanded="false" aria-controls="collapseHint3">
   <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 </button>
-<div id="collapseHint3" class="accordion-collapse collapse" aria-labelledby="headingHint3" data-bs-parent="#accordionHint3">
+<div id="collapseHint3" class="accordion-collapse collapse" data-bs-parent="#accordionHint3" aria-labelledby="headingHint3">
 <div class="accordion-body">
 <p>Add another geom!</p>
 </div>
@@ -1026,7 +1026,7 @@ <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1127,7 +1127,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint4" aria-expanded="false" aria-controls="collapseHint4">
   <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 </button>
-<div id="collapseHint4" class="accordion-collapse collapse" aria-labelledby="headingHint4" data-bs-parent="#accordionHint4">
+<div id="collapseHint4" class="accordion-collapse collapse" data-bs-parent="#accordionHint4" aria-labelledby="headingHint4">
 <div class="accordion-body">
 <p>Add another facet variable with the <code>+</code></p>
 </div>
@@ -1139,7 +1139,7 @@ <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8"> Show me the solution </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1232,8 +1232,8 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/02-data-visualisation.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/02-data-visualisation.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/03-data-subsetting.html b/03-data-subsetting.html
index 8beef6b..efa9568 100644
--- a/03-data-subsetting.html
+++ b/03-data-subsetting.html
@@ -364,7 +364,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Subsetting data with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/03-data-subsetting.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1584,8 +1584,8 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/03-data-subsetting.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/03-data-subsetting.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/04-data-sorting-pipes.html b/04-data-sorting-pipes.html
index d22517b..7cce1b5 100644
--- a/04-data-sorting-pipes.html
+++ b/04-data-sorting-pipes.html
@@ -365,7 +365,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data sorting and pipes dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/04-data-sorting-pipes.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1155,8 +1155,8 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/04-data-sorting-pipes.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/04-data-sorting-pipes.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/05-data-plotting-scales.html b/05-data-plotting-scales.html
index 8d5464f..8bcfb06 100644
--- a/05-data-plotting-scales.html
+++ b/05-data-plotting-scales.html
@@ -361,7 +361,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data visualisation and scales</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/05-data-plotting-scales.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -929,8 +929,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/05-data-plotting-scales.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/05-data-plotting-scales.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/06-data-manipulation.html b/06-data-manipulation.html
index 64b405f..8395579 100644
--- a/06-data-manipulation.html
+++ b/06-data-manipulation.html
@@ -361,7 +361,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data manipulation with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/06-data-manipulation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1125,8 +1125,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/06-data-manipulation.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/06-data-manipulation.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/07-data-reshaping.html b/07-data-reshaping.html
index 6cf4abf..b082f12 100644
--- a/07-data-reshaping.html
+++ b/07-data-reshaping.html
@@ -362,7 +362,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Reshaping data with tidyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/07-data-reshaping.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -518,7 +518,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -566,7 +566,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -614,7 +614,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -739,7 +739,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -791,7 +791,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb17">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -843,7 +843,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb19">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1118,7 +1118,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1301,8 +1301,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
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-  "dateCreated": "2024-08-25",
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diff --git a/08-data-summaries.html b/08-data-summaries.html
index d63ef47..ef1c5ee 100644
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         <h1>Data summaries with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/08-data-summaries.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -537,7 +537,7 @@ <h3 class="callout-title">Challenge 2</h3>
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-  "dateCreated": "2024-08-25",
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+  "dateCreated": "2024-10-08",
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diff --git a/09-data-complex-pipelines.html b/09-data-complex-pipelines.html
index 78f84c0..fa7b156 100644
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       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Complex data pipelines</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/09-data-complex-pipelines.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1460,8 +1460,8 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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-  "dateCreated": "2024-08-25",
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+  "dateCreated": "2024-10-08",
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diff --git a/10-data-manipulation-across.html b/10-data-manipulation-across.html
index f80965a..0910c04 100644
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@@ -363,7 +363,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
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       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data manipulation across columns</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/10-data-manipulation-across.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -555,7 +555,7 @@ <h3 class="callout-title">Challenge 1</h3>
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -854,7 +854,7 @@ <h3 class="callout-title">Challenge 4</h3>
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 <div class="accordion-body">
 <p>You can add a standard mutate within the same mutate as across</p>
 </div>
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@@ -987,8 +987,8 @@ <h3 id="learning-more">Learning more<a class="anchor" aria-label="anchor" href="
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-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/404.html b/404.html
index 11c2a24..bfa7c71 100644
--- a/404.html
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@@ -418,7 +418,7 @@ <h1>Page not found</h1>
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/404.html",
-  "dateCreated": "2024-08-25",
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index c32df1f..ef98edc 100644
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       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Contributor Code of Conduct</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/CODE_OF_CONDUCT.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -432,8 +432,8 @@ <h1>Contributor Code of Conduct</h1>
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-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
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 }
 
diff --git a/LICENSE.html b/LICENSE.html
index fa3ad1e..e72b5a6 100644
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@@ -350,7 +350,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
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       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Licenses</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/LICENSE.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -481,8 +481,8 @@ <h1>Licenses</h1>
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diff --git a/aio.html b/aio.html
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 <section id="aio-01-project-introduction"><p>Content from <a href="01-project-introduction.html">Introduction to R and RStudio</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/01-project-introduction.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
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@@ -825,7 +825,7 @@ <h3 id="version-control">Version Control<a class="anchor" aria-label="anchor" hr
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-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/02-data-visualisation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -1049,7 +1049,7 @@ <h3 class="callout-title">Challenge 1a</h3>
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 <p>The* <code>penguins</code> *dataset has a column called
 <code>year</code>, which should appear on the x-axis.</p>
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+<div id="collapseHint2" class="accordion-collapse collapse" data-bs-parent="#accordionHint2" aria-labelledby="headingHint2">
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 <p><code>alpha</code> takes a value from 0 (transparent) to 1
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@@ -1311,7 +1311,7 @@ <h3 class="callout-title">Challenge 4</h3>
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+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1446,7 +1446,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 <div class="accordion-body">
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@@ -1494,7 +1494,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint3" aria-expanded="false" aria-controls="collapseHint3">
   <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 </button>
-<div id="collapseHint3" class="accordion-collapse collapse" aria-labelledby="headingHint3" data-bs-parent="#accordionHint3">
+<div id="collapseHint3" class="accordion-collapse collapse" data-bs-parent="#accordionHint3" aria-labelledby="headingHint3">
 <div class="accordion-body">
 <p>Add another geom!</p>
 </div>
@@ -1506,7 +1506,7 @@ <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1608,7 +1608,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint4" aria-expanded="false" aria-controls="collapseHint4">
   <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 </button>
-<div id="collapseHint4" class="accordion-collapse collapse" aria-labelledby="headingHint4" data-bs-parent="#accordionHint4">
+<div id="collapseHint4" class="accordion-collapse collapse" data-bs-parent="#accordionHint4" aria-labelledby="headingHint4">
 <div class="accordion-body">
 <p>Add another facet variable with the <code>+</code></p>
 </div>
@@ -1620,7 +1620,7 @@ <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8"> Show me the solution </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
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@@ -1656,7 +1656,7 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
 </div>
 </div></section><section id="aio-03-data-subsetting"><p>Content from <a href="03-data-subsetting.html">Subsetting data with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/03-data-subsetting.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -2835,7 +2835,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-04-data-sorting-pipes"><p>Content from <a href="04-data-sorting-pipes.html">Data sorting and pipes dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/04-data-sorting-pipes.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -3577,7 +3577,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-05-data-plotting-scales"><p>Content from <a href="05-data-plotting-scales.html">Data visualisation and scales</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/05-data-plotting-scales.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -4099,7 +4099,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-06-data-manipulation"><p>Content from <a href="06-data-manipulation.html">Data manipulation with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/06-data-manipulation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -4807,7 +4807,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-07-data-reshaping"><p>Content from <a href="07-data-reshaping.html">Reshaping data with tidyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/07-data-reshaping.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -4975,7 +4975,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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@@ -5023,7 +5023,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -5071,7 +5071,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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@@ -5197,7 +5197,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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@@ -5249,7 +5249,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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@@ -5301,7 +5301,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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@@ -5578,7 +5578,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
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@@ -5704,7 +5704,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-08-data-summaries"><p>Content from <a href="08-data-summaries.html">Data summaries with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/08-data-summaries.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -5886,7 +5886,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5929,7 +5929,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb14">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6127,7 +6127,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
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@@ -6172,7 +6172,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
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@@ -6337,7 +6337,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
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@@ -6532,7 +6532,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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@@ -6580,7 +6580,7 @@ <h3 class="callout-title">Challenge 8</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
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@@ -6630,7 +6630,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
 </div>
 </div></section><section id="aio-09-data-complex-pipelines"><p>Content from <a href="09-data-complex-pipelines.html">Complex data pipelines</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/09-data-complex-pipelines.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -7686,7 +7686,7 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
 </div>
 </div></section><section id="aio-10-data-manipulation-across"><p>Content from <a href="10-data-manipulation-across.html">Data manipulation across columns</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/10-data-manipulation-across.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -7876,7 +7876,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb9">
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@@ -7933,7 +7933,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
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@@ -8122,7 +8122,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="codewrapper sourceCode" id="cb20">
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@@ -8177,7 +8177,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint1" aria-expanded="false" aria-controls="collapseHint1">
   <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>You can add a standard mutate within the same mutate as across</p>
 </div>
@@ -8189,7 +8189,7 @@ <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
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@@ -8303,7 +8303,7 @@ <h3 id="learning-more">Learning more<a class="anchor" aria-label="anchor" href="
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-  "dateCreated": "2024-08-25",
+  "dateCreated": "2024-10-08",
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   "datePublished": "2024-10-08"
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diff --git a/images.html b/images.html
index 0d02024..e64ea48 100644
--- a/images.html
+++ b/images.html
@@ -646,7 +646,7 @@ <h3 id="09-data-complex-pipelines-figure-22">Figure 22</h3>
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/images.html",
-  "dateCreated": "2024-08-25",
+  "dateCreated": "2024-10-08",
   "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
diff --git a/index.html b/index.html
index abc3533..1a0fa61 100644
--- a/index.html
+++ b/index.html
@@ -521,7 +521,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   "creativeWorkStatus": "active",
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/index.html",
-  "dateCreated": "2024-08-25",
+  "dateCreated": "2024-10-08",
   "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
diff --git a/instructor-notes.html b/instructor-notes.html
index 0d046fb..e0c3471 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -467,7 +467,7 @@ <h1>Instructor Notes</h1>
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor-notes.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor-notes.html",
-  "dateCreated": "2024-08-25",
+  "dateCreated": "2024-10-08",
   "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
diff --git a/instructor/01-project-introduction.html b/instructor/01-project-introduction.html
index 630dd5f..d882e42 100644
--- a/instructor/01-project-introduction.html
+++ b/instructor/01-project-introduction.html
@@ -367,7 +367,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Introduction to R and RStudio</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/01-project-introduction.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -777,8 +777,8 @@ <h3 id="version-control">Version Control<a class="anchor" aria-label="anchor" hr
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-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/02-data-visualisation.html b/instructor/02-data-visualisation.html
index 1cf2f7e..4994c1a 100644
--- a/instructor/02-data-visualisation.html
+++ b/instructor/02-data-visualisation.html
@@ -363,7 +363,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Visualisation with ggplot2</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/02-data-visualisation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -577,7 +577,7 @@ <h3 class="callout-title">Challenge 1a</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint1" aria-expanded="false" aria-controls="collapseHint1">
   <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
 <div class="accordion-body">
 <p>The* <code>penguins</code> *dataset has a column called
 <code>year</code>, which should appear on the x-axis.</p>
@@ -590,7 +590,7 @@ <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb4">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -625,7 +625,7 @@ <h3 class="callout-title">Challenge 1b</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -680,7 +680,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -785,7 +785,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint2" aria-expanded="false" aria-controls="collapseHint2">
   <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 </button>
-<div id="collapseHint2" class="accordion-collapse collapse" aria-labelledby="headingHint2" data-bs-parent="#accordionHint2">
+<div id="collapseHint2" class="accordion-collapse collapse" data-bs-parent="#accordionHint2" aria-labelledby="headingHint2">
 <div class="accordion-body">
 <p><code>alpha</code> takes a value from 0 (transparent) to 1
 (solid).</p>
@@ -798,7 +798,7 @@ <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -833,7 +833,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -967,7 +967,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb17">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1015,7 +1015,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint3" aria-expanded="false" aria-controls="collapseHint3">
   <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 </button>
-<div id="collapseHint3" class="accordion-collapse collapse" aria-labelledby="headingHint3" data-bs-parent="#accordionHint3">
+<div id="collapseHint3" class="accordion-collapse collapse" data-bs-parent="#accordionHint3" aria-labelledby="headingHint3">
 <div class="accordion-body">
 <p>Add another geom!</p>
 </div>
@@ -1027,7 +1027,7 @@ <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1128,7 +1128,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint4" aria-expanded="false" aria-controls="collapseHint4">
   <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 </button>
-<div id="collapseHint4" class="accordion-collapse collapse" aria-labelledby="headingHint4" data-bs-parent="#accordionHint4">
+<div id="collapseHint4" class="accordion-collapse collapse" data-bs-parent="#accordionHint4" aria-labelledby="headingHint4">
 <div class="accordion-body">
 <p>Add another facet variable with the <code>+</code></p>
 </div>
@@ -1140,7 +1140,7 @@ <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8"> Show me the solution </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1233,8 +1233,8 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/02-data-visualisation.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/03-data-subsetting.html b/instructor/03-data-subsetting.html
index 10ea5aa..49946bb 100644
--- a/instructor/03-data-subsetting.html
+++ b/instructor/03-data-subsetting.html
@@ -363,7 +363,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Subsetting data with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/03-data-subsetting.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1585,8 +1585,8 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/03-data-subsetting.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/03-data-subsetting.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/04-data-sorting-pipes.html b/instructor/04-data-sorting-pipes.html
index 6e09ffa..0b0f719 100644
--- a/instructor/04-data-sorting-pipes.html
+++ b/instructor/04-data-sorting-pipes.html
@@ -364,7 +364,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data sorting and pipes dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/04-data-sorting-pipes.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1279,8 +1279,8 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/04-data-sorting-pipes.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/05-data-plotting-scales.html b/instructor/05-data-plotting-scales.html
index 93b9dcd..fe774c9 100644
--- a/instructor/05-data-plotting-scales.html
+++ b/instructor/05-data-plotting-scales.html
@@ -360,7 +360,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data visualisation and scales</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/05-data-plotting-scales.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -962,8 +962,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/05-data-plotting-scales.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/05-data-plotting-scales.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/06-data-manipulation.html b/instructor/06-data-manipulation.html
index ebb4d12..172587b 100644
--- a/instructor/06-data-manipulation.html
+++ b/instructor/06-data-manipulation.html
@@ -360,7 +360,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data manipulation with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/06-data-manipulation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1126,8 +1126,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/06-data-manipulation.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/07-data-reshaping.html b/instructor/07-data-reshaping.html
index c916a79..b2b4aa2 100644
--- a/instructor/07-data-reshaping.html
+++ b/instructor/07-data-reshaping.html
@@ -361,7 +361,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Reshaping data with tidyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/07-data-reshaping.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -519,7 +519,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -567,7 +567,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -615,7 +615,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -740,7 +740,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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@@ -792,7 +792,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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@@ -844,7 +844,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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@@ -1119,7 +1119,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="codewrapper sourceCode" id="cb34">
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@@ -1302,8 +1302,8 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/07-data-reshaping.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/08-data-summaries.html b/instructor/08-data-summaries.html
index e56dcf0..d658fd6 100644
--- a/instructor/08-data-summaries.html
+++ b/instructor/08-data-summaries.html
@@ -353,7 +353,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data summaries with dplyr</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/08-data-summaries.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -538,7 +538,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -581,7 +581,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -777,7 +777,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -822,7 +822,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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@@ -986,7 +986,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
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@@ -1180,7 +1180,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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@@ -1228,7 +1228,7 @@ <h3 class="callout-title">Challenge 8</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb55">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1337,8 +1337,8 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/08-data-summaries.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/08-data-summaries.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/09-data-complex-pipelines.html b/instructor/09-data-complex-pipelines.html
index cf546b2..f47e6cb 100644
--- a/instructor/09-data-complex-pipelines.html
+++ b/instructor/09-data-complex-pipelines.html
@@ -353,7 +353,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Complex data pipelines</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/09-data-complex-pipelines.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -1461,8 +1461,8 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/09-data-complex-pipelines.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/09-data-complex-pipelines.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/10-data-manipulation-across.html b/instructor/10-data-manipulation-across.html
index 099a700..d8baf92 100644
--- a/instructor/10-data-manipulation-across.html
+++ b/instructor/10-data-manipulation-across.html
@@ -362,7 +362,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Data manipulation across columns</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/10-data-manipulation-across.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -556,7 +556,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -613,7 +613,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -800,7 +800,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb20">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -855,7 +855,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint1" aria-expanded="false" aria-controls="collapseHint1">
   <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
 <div class="accordion-body">
 <p>You can add a standard mutate within the same mutate as across</p>
 </div>
@@ -867,7 +867,7 @@ <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -988,8 +988,8 @@ <h3 id="learning-more">Learning more<a class="anchor" aria-label="anchor" href="
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   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/10-data-manipulation-across.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/10-data-manipulation-across.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/404.html b/instructor/404.html
index 2154ab6..4aac779 100644
--- a/instructor/404.html
+++ b/instructor/404.html
@@ -418,7 +418,7 @@ <h1>Page not found</h1>
   "creativeWorkStatus": "active",
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/404.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/404.html",
-  "dateCreated": "2024-08-25",
+  "dateCreated": "2024-10-08",
   "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 86a05da..7d6a53f 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -349,7 +349,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Contributor Code of Conduct</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/CODE_OF_CONDUCT.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -433,8 +433,8 @@ <h1>Contributor Code of Conduct</h1>
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/CODE_OF_CONDUCT.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 279b1a3..98c8a1a 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -349,7 +349,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Licenses</h1>
-        <p>Last updated on 2024-09-24 |
+        <p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/LICENSE.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 
@@ -482,8 +482,8 @@ <h1>Licenses</h1>
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/LICENSE.html",
-  "dateCreated": "2024-08-25",
-  "dateModified": "2024-09-24",
+  "dateCreated": "2024-10-08",
+  "dateModified": "2024-10-08",
   "datePublished": "2024-10-08"
 }
 
diff --git a/instructor/aio.html b/instructor/aio.html
index de24b87..13a9e2d 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -414,7 +414,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
         
 <section id="aio-01-project-introduction"><p>Content from <a href="01-project-introduction.html">Introduction to R and RStudio</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/01-project-introduction.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 49 minutes</p>
@@ -826,7 +826,7 @@ <h3 id="version-control">Version Control<a class="anchor" aria-label="anchor" hr
 </div>
 </section></section><section id="aio-02-data-visualisation"><p>Content from <a href="02-data-visualisation.html">Visualisation with ggplot2</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/02-data-visualisation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 68 minutes</p>
@@ -1051,7 +1051,7 @@ <h3 class="callout-title">Challenge 1a</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint1" aria-expanded="false" aria-controls="collapseHint1">
   <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 </button>
-<div id="collapseHint1" class="accordion-collapse collapse" aria-labelledby="headingHint1" data-bs-parent="#accordionHint1">
+<div id="collapseHint1" class="accordion-collapse collapse" data-bs-parent="#accordionHint1" aria-labelledby="headingHint1">
 <div class="accordion-body">
 <p>The* <code>penguins</code> *dataset has a column called
 <code>year</code>, which should appear on the x-axis.</p>
@@ -1064,7 +1064,7 @@ <h4 class="accordion-header" id="headingHint1"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb4">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1100,7 +1100,7 @@ <h3 class="callout-title">Challenge 1b</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
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@@ -1158,7 +1158,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1264,7 +1264,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint2" aria-expanded="false" aria-controls="collapseHint2">
   <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 </button>
-<div id="collapseHint2" class="accordion-collapse collapse" aria-labelledby="headingHint2" data-bs-parent="#accordionHint2">
+<div id="collapseHint2" class="accordion-collapse collapse" data-bs-parent="#accordionHint2" aria-labelledby="headingHint2">
 <div class="accordion-body">
 <p><code>alpha</code> takes a value from 0 (transparent) to 1
 (solid).</p>
@@ -1277,7 +1277,7 @@ <h4 class="accordion-header" id="headingHint2"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
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@@ -1313,7 +1313,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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@@ -1448,7 +1448,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb17">
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@@ -1496,7 +1496,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint3" aria-expanded="false" aria-controls="collapseHint3">
   <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 </button>
-<div id="collapseHint3" class="accordion-collapse collapse" aria-labelledby="headingHint3" data-bs-parent="#accordionHint3">
+<div id="collapseHint3" class="accordion-collapse collapse" data-bs-parent="#accordionHint3" aria-labelledby="headingHint3">
 <div class="accordion-body">
 <p>Add another geom!</p>
 </div>
@@ -1508,7 +1508,7 @@ <h4 class="accordion-header" id="headingHint3"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1610,7 +1610,7 @@ <h3 class="callout-title">Challenge 7</h3>
 <button class="accordion-button hint-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHint4" aria-expanded="false" aria-controls="collapseHint4">
   <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 </button>
-<div id="collapseHint4" class="accordion-collapse collapse" aria-labelledby="headingHint4" data-bs-parent="#accordionHint4">
+<div id="collapseHint4" class="accordion-collapse collapse" data-bs-parent="#accordionHint4" aria-labelledby="headingHint4">
 <div class="accordion-body">
 <p>Add another facet variable with the <code>+</code></p>
 </div>
@@ -1622,7 +1622,7 @@ <h4 class="accordion-header" id="headingHint4"> Give me a hint </h4>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution8" aria-expanded="false" aria-controls="collapseSolution8">
   <h4 class="accordion-header" id="headingSolution8"> Show me the solution </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1658,7 +1658,7 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
 </div>
 </div></section><section id="aio-03-data-subsetting"><p>Content from <a href="03-data-subsetting.html">Subsetting data with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/03-data-subsetting.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 72 minutes</p>
@@ -2838,7 +2838,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-04-data-sorting-pipes"><p>Content from <a href="04-data-sorting-pipes.html">Data sorting and pipes dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/04-data-sorting-pipes.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 67 minutes</p>
@@ -3704,7 +3704,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-05-data-plotting-scales"><p>Content from <a href="05-data-plotting-scales.html">Data visualisation and scales</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/05-data-plotting-scales.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 65 minutes</p>
@@ -4259,7 +4259,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-06-data-manipulation"><p>Content from <a href="06-data-manipulation.html">Data manipulation with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/06-data-manipulation.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 65 minutes</p>
@@ -4968,7 +4968,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-07-data-reshaping"><p>Content from <a href="07-data-reshaping.html">Reshaping data with tidyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/07-data-reshaping.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 66 minutes</p>
@@ -5137,7 +5137,7 @@ <h3 class="callout-title">Challenge 1</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb5">
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@@ -5185,7 +5185,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
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@@ -5233,7 +5233,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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@@ -5359,7 +5359,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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@@ -5411,7 +5411,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
   <h4 class="accordion-header" id="headingSolution5"> Show me the solution </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb17">
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@@ -5463,7 +5463,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution6" aria-expanded="false" aria-controls="collapseSolution6">
   <h4 class="accordion-header" id="headingSolution6"> Show me the solution </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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@@ -5740,7 +5740,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
   <h4 class="accordion-header" id="headingSolution7"> Show me the solution </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
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@@ -5866,7 +5866,7 @@ <h1 id="wrap-up">Wrap up<a class="anchor" aria-label="anchor" href="#wrap-up"></
  -->
 </div></section><section id="aio-08-data-summaries"><p>Content from <a href="08-data-summaries.html">Data summaries with dplyr</a></p>
 <hr>
-<p>Last updated on 2024-09-24 |
+<p>Last updated on 2024-10-08 |
 
         <a href="https://github.com/athanasiamo/r-tidyverse-4-datasets/edit/main/episodes/08-data-summaries.Rmd" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <p>Estimated time: <i aria-hidden="true" data-feather="clock"></i> 68 minutes</p>
@@ -6049,7 +6049,7 @@ <h3 class="callout-title">Challenge 2</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <h4 class="accordion-header" id="headingSolution1"> Show me the solution </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6092,7 +6092,7 @@ <h3 class="callout-title">Challenge 3</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
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@@ -6290,7 +6290,7 @@ <h3 class="callout-title">Challenge 4</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution3" aria-expanded="false" aria-controls="collapseSolution3">
   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
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@@ -6335,7 +6335,7 @@ <h3 class="callout-title">Challenge 5</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
   <h4 class="accordion-header" id="headingSolution4"> Show me the solution </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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@@ -6500,7 +6500,7 @@ <h3 class="callout-title">Challenge 6</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
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