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diff --git a/23-starting-with-r.html b/23-starting-with-r.html
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index 441946cb2..558ba6879 100644
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+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Let’s first calculate the mean expression level of X and Y linked
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+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>Let’s first calculate the mean expression by gene and by time</p>
 <div class="codewrapper sourceCode" id="cb113">
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 <p>Starting from the rna_time tibble:</p>
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diff --git a/40-visualization.html b/40-visualization.html
index 9fd9abc80..0f2557876 100644
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diff --git a/60-next-steps.html b/60-next-steps.html
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@@ -1469,7 +1469,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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index 5ea8bb158..e9322ecc5 100644
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diff --git a/LICENSE.html b/LICENSE.html
index 5bc59fc77..a60b843fc 100644
--- a/LICENSE.html
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diff --git a/aio.html b/aio.html
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+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Let’s first calculate the mean expression level of X and Y linked
 genes from male and female samples…</p>
@@ -6787,7 +6787,7 @@ <h3 class="callout-title">Question<a class="anchor" aria-label="anchor" href="#q
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 <div class="accordion-body">
 <p>Let’s first calculate the mean expression by gene and by time</p>
 <div class="codewrapper sourceCode" id="cb113">
@@ -7007,7 +7007,7 @@ <h3 class="callout-title">Question<a class="anchor" aria-label="anchor" href="#q
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-<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">
 <p>Starting from the rna_time tibble:</p>
 <div class="codewrapper sourceCode" id="cb129">
@@ -7292,7 +7292,7 @@ <h3 class="callout-title">Challenge:<a class="anchor" aria-label="anchor" href="
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index e16e2158a..f33b6acdb 100644
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diff --git a/pkgdown.yml b/pkgdown.yml
index d06aecf30..be3a7088d 100644
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