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index 8e16a2a4..613a51e0 100644
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diff --git a/02-data-visualisation.html b/02-data-visualisation.html
index d0587143..c162e52f 100644
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diff --git a/03-data-subsetting.html b/03-data-subsetting.html
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--- a/03-data-subsetting.html
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diff --git a/04-data-sorting-pipes.html b/04-data-sorting-pipes.html
index 717eac6f..dbeab3ce 100644
--- a/04-data-sorting-pipes.html
+++ b/04-data-sorting-pipes.html
@@ -453,7 +453,7 @@ <h3 class="callout-title">Challenge 1<a class="anchor" aria-label="anchor" href=
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@@ -981,7 +981,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
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@@ -1114,7 +1114,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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diff --git a/05-data-plotting-scales.html b/05-data-plotting-scales.html
index daaceadf..0048db02 100644
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diff --git a/06-data-manipulation.html b/06-data-manipulation.html
index 85dd5d95..5b0e669b 100644
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diff --git a/07-data-reshaping.html b/07-data-reshaping.html
index 42edd24e..0cd2c98a 100644
--- a/07-data-reshaping.html
+++ b/07-data-reshaping.html
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diff --git a/09-data-complex-pipelines.html b/09-data-complex-pipelines.html
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@@ -5301,7 +5301,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
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-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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@@ -5579,7 +5579,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
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-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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@@ -8329,8 +8329,8 @@ <h3 id="learning-more">Learning more<a class="anchor" aria-label="anchor" href="
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-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
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diff --git a/images.html b/images.html
index dd4d9f49..cf813930 100644
--- a/images.html
+++ b/images.html
@@ -589,8 +589,8 @@ <h3 id="09-data-complex-pipelines-figure-22">Figure 22</h3>
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-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
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diff --git a/index.html b/index.html
index 92fcfb7e..61b8221f 100644
--- a/index.html
+++ b/index.html
@@ -460,8 +460,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
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-  "dateModified": "2024-05-28",
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diff --git a/instructor-notes.html b/instructor-notes.html
index cf421a7c..d22e52ad 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -410,8 +410,8 @@ <h1>Instructor Notes</h1>
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   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
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diff --git a/instructor/01-project-introduction.html b/instructor/01-project-introduction.html
index c85905de..87349575 100644
--- a/instructor/01-project-introduction.html
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@@ -745,7 +745,7 @@ <h3 id="version-control">Version Control<a class="anchor" aria-label="anchor" hr
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   "dateModified": "2024-05-21",
-  "datePublished": "2024-05-28"
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diff --git a/instructor/02-data-visualisation.html b/instructor/02-data-visualisation.html
index 6f24d8d8..73dd8152 100644
--- a/instructor/02-data-visualisation.html
+++ b/instructor/02-data-visualisation.html
@@ -1197,7 +1197,7 @@ <h2 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
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-  "datePublished": "2024-05-28"
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diff --git a/instructor/03-data-subsetting.html b/instructor/03-data-subsetting.html
index 694e9b15..dca0cc48 100644
--- a/instructor/03-data-subsetting.html
+++ b/instructor/03-data-subsetting.html
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -1025,7 +1025,7 @@ <h3 class="callout-title">Challenge 7<a class="anchor" aria-label="anchor" href=
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-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
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@@ -1305,7 +1305,7 @@ <h3 class="callout-title">Challenge 10<a class="anchor" aria-label="anchor" href
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-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
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@@ -1356,7 +1356,7 @@ <h3 class="callout-title">Challenge 11<a class="anchor" aria-label="anchor" href
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution11" aria-expanded="false" aria-controls="collapseSolution11">
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-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
+<div id="collapseSolution11" class="accordion-collapse collapse" data-bs-parent="#accordionSolution11" aria-labelledby="headingSolution11">
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 <div class="codewrapper sourceCode" id="cb54">
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@@ -1446,7 +1446,7 @@ <h3 class="callout-title">Challenge 12<a class="anchor" aria-label="anchor" href
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-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
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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>
@@ -1551,7 +1551,7 @@ <h1 id="wrap-up">Wrap-up<a class="anchor" aria-label="anchor" href="#wrap-up"></
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/03-data-subsetting.html",
   "dateCreated": "2024-05-08",
   "dateModified": "2024-05-21",
-  "datePublished": "2024-05-28"
+  "datePublished": "2024-06-04"
 }
 
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diff --git a/instructor/04-data-sorting-pipes.html b/instructor/04-data-sorting-pipes.html
index 04a1ac92..416d29d1 100644
--- a/instructor/04-data-sorting-pipes.html
+++ b/instructor/04-data-sorting-pipes.html
@@ -454,7 +454,7 @@ <h3 class="callout-title">Challenge 1<a class="anchor" aria-label="anchor" href=
 <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="cb6">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -499,7 +499,7 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   <h3 class="accordion-header" id="headingInstructor1">
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-<div id="collapseInstructor1" class="accordion-collapse collapse" data-bs-parent="#accordionInstructor1" aria-labelledby="headingInstructor1">
+<div id="collapseInstructor1" class="accordion-collapse collapse" aria-labelledby="headingInstructor1" data-bs-parent="#accordionInstructor1">
 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -563,7 +563,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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+<div id="collapseInstructor2" class="accordion-collapse collapse" aria-labelledby="headingInstructor2" data-bs-parent="#accordionInstructor2">
 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -605,7 +605,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -648,7 +648,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
   <h3 class="accordion-header" id="headingInstructor4">
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+<div id="collapseInstructor4" class="accordion-collapse collapse" aria-labelledby="headingInstructor4" data-bs-parent="#accordionInstructor4">
 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -713,7 +713,7 @@ <h3 class="callout-title">Challenge 2<a class="anchor" aria-label="anchor" href=
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <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>
@@ -759,7 +759,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
   <h3 class="accordion-header" id="headingInstructor5">
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 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -808,7 +808,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
   <h3 class="accordion-header" id="headingInstructor6">
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 <p>When reading this part, read it as follows when typing:</p>
 <blockquote>
@@ -862,7 +862,7 @@ <h3 class="callout-title">Challenge 3<a class="anchor" aria-label="anchor" href=
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diff --git a/instructor/05-data-plotting-scales.html b/instructor/05-data-plotting-scales.html
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diff --git a/instructor/10-data-manipulation-across.html b/instructor/10-data-manipulation-across.html
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index a89ba856..94e26bb4 100644
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diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
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 <blockquote>
@@ -3109,7 +3109,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <blockquote>
@@ -3152,7 +3152,7 @@ <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"><
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 <p>When reading this part, read it as follows when typing:</p>
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@@ -3217,7 +3217,7 @@ <h3 class="callout-title">Challenge 2<a class="anchor" aria-label="anchor" href=
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 <p>When reading this part, read it as follows when typing:</p>
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@@ -3469,7 +3469,7 @@ <h3 class="callout-title">Challenge 5<a class="anchor" aria-label="anchor" href=
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 <p>When reading this part, read it as follows when typing:</p>
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 <div class="accordion-body">
 <p>When reading this part, read it as follows when typing:</p>
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@@ -3621,7 +3621,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
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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>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="codewrapper sourceCode" id="cb5">
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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@@ -5473,7 +5473,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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@@ -5751,7 +5751,7 @@ <h3 class="callout-title">Challenge 6<a class="anchor" aria-label="anchor" href=
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution7" aria-expanded="false" aria-controls="collapseSolution7">
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 </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">
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 <div class="codewrapper sourceCode" id="cb34">
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@@ -8504,8 +8504,8 @@ <h3 id="learning-more">Learning more<a class="anchor" aria-label="anchor" href="
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   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/aio.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/instructor/images.html b/instructor/images.html
index ed8610d2..f69b5a38 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -589,8 +589,8 @@ <h3 id="09-data-complex-pipelines-figure-22">Figure 22</h3>
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/images.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/images.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index 510d2cc0..46e430b0 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -572,8 +572,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/index.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/index.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 94c74355..941e2f64 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -517,8 +517,8 @@ <h3 id="05-data-plotting-scales-headingInstructor1">
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/instructor-notes.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/instructor-notes.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index 09cb5885..e307f935 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -428,8 +428,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/key-points.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/key-points.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index 0824bc5a..a51ec5f0 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -333,8 +333,8 @@ <h1>Learner Profiles</h1>
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/profiles.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/instructor/profiles.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index e336ccb0..40d19138 100644
--- a/key-points.html
+++ b/key-points.html
@@ -428,8 +428,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/key-points.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/key-points.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index 00789cde..e476c2a3 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 3.1.11
 pkgdown: 2.0.9
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-05-28T00:50Z
+last_built: 2024-06-04T00:51Z
 
diff --git a/profiles.html b/profiles.html
index 7ef29d4f..0720caf3 100644
--- a/profiles.html
+++ b/profiles.html
@@ -334,8 +334,8 @@ <h1>Learner Profiles</h1>
   "url": "https://athanasiamo.github.io/r-tidyverse-4-datasets/profiles.html",
   "identifier": "https://athanasiamo.github.io/r-tidyverse-4-datasets/profiles.html",
   "dateCreated": "2024-05-08",
-  "dateModified": "2024-05-28",
-  "datePublished": "2024-05-28"
+  "dateModified": "2024-06-04",
+  "datePublished": "2024-06-04"
 }
 
   </script><script>