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diff --git a/CONTRIBUTORS.html b/CONTRIBUTORS.html
index df4c89e4..c74b9468 100644
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diff --git a/LICENSE.html b/LICENSE.html
index 3637fbfc..7320a546 100644
--- a/LICENSE.html
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diff --git a/aio.html b/aio.html
index 6864f705..f1cfddc0 100644
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@@ -3881,7 +3881,7 @@ <h3 class="callout-title">Counting</h3>
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+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The method <code>.count()</code> gives you the number of non-NaN
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@@ -3891,7 +3891,7 @@ <h4 class="accordion-header" id="headingSolution3"> Hints </h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -7626,8 +7626,8 @@ <h3 class="callout-title">Key Points</h3>
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index 28874dbd..e6a56963 100644
--- a/extra_challenges.html
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <p><code>surveys_df[::-1]</code> provides every row of the DataFrame, in
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <p>We get the expected files for all years between 1977 and 2002, plus
 an empty <code>data/surveys1976.csv</code> file with only the
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diff --git a/images.html b/images.html
index f9621f40..1566721e 100644
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diff --git a/index.html b/index.html
index 963278ff..4bd73095 100644
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p>Open <a href="https://www.anaconda.com/products/individual" class="external-link">https://www.anaconda.com/products/individual</a>
 in your web browser.</p></li>
@@ -482,7 +482,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p>Visit <a href="https://www.anaconda.com/products/individual" class="external-link">https://www.anaconda.com/products/individual</a>
 in your web browser.</p></li>
@@ -514,7 +514,7 @@ <h4 class="accordion-header" id="headingSolution3">
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