diff --git a/01-rstudio-intro.html b/01-rstudio-intro.html
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 <div class="accordion-body">
 <p>One way of answering this question in R is to use the
 <code>&gt;</code> to set up the following:</p>
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 <div class="accordion-body">
 <p>The following can be used as R variables:</p>
 <div class="codewrapper sourceCode" id="cb42">
@@ -1008,7 +1008,7 @@ <h3 class="callout-title">Challenge 4</h3>
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+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We would use the following R code to install the <code>ggplot2</code>
 package:</p>
@@ -1077,7 +1077,7 @@ <h3 class="callout-title">Challenge 5</h3>
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 <div class="accordion-body">
 <p>The correct answers are b and c. Answer a will install, not load, the
 ggplot2 package. Answer b will correctly load the ggplot2 package. Note
@@ -1170,7 +1170,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/02-project-intro.html b/02-project-intro.html
index 47a40769..5ddde8de 100644
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diff --git a/03-data-structures-part1.html b/03-data-structures-part1.html
index e62ef8d1..ffc49aa6 100644
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diff --git a/04-data-structures-part2.html b/04-data-structures-part2.html
index bf7cacaa..689a95c9 100644
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@@ -1098,7 +1098,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/05-data-subsetting.html b/05-data-subsetting.html
index 346c65f4..483358d5 100644
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 </button>
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+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1124,7 +1124,7 @@ <h3 class="callout-title">Challenge 4</h3>
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>gapminder</code> is a data.frame so it needs to be
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@@ -1216,7 +1216,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/06-dplyr.html b/06-dplyr.html
index 34e44f2d..df54a313 100644
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index 20cb653f..3699bdb5 100644
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diff --git a/404.html b/404.html
index 5ceab98a..528075c5 100644
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index 85c49468..c58be57b 100644
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   "dateCreated": "2018-04-05",
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diff --git a/LICENSE.html b/LICENSE.html
index ee82d8ba..4d646838 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -451,7 +451,7 @@ <h1>Licenses</h1>
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   "dateCreated": "2018-04-05",
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diff --git a/aio.html b/aio.html
index 5ca8ba99..1410d064 100644
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 <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>
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 <div class="accordion-body">
 <p>One way of answering this question in R is to use the
 <code>&gt;</code> to set up the following:</p>
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 <div class="accordion-body">
 <p>The following can be used as R variables:</p>
 <div class="codewrapper sourceCode" id="cb42">
@@ -1085,7 +1085,7 @@ <h3 class="callout-title">Challenge 4</h3>
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 <div class="accordion-body">
 <p>We would use the following R code to install the <code>ggplot2</code>
 package:</p>
@@ -1156,7 +1156,7 @@ <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">
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 <div class="accordion-body">
 <p>The correct answers are b and c. Answer a will install, not load, the
 ggplot2 package. Answer b will correctly load the ggplot2 package. Note
@@ -3807,7 +3807,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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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>
@@ -4215,7 +4215,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
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 </button>
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+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal">
@@ -4298,7 +4298,7 @@ <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"> Solution to challenge 4 </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">
 <ol style="list-style-type: decimal">
 <li><p><code>gapminder</code> is a data.frame so it needs to be
@@ -5239,7 +5239,7 @@ <h3 class="callout-title">Challenge 1</h3>
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