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--- a/01-intro.html
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 <p>Creates a substring from index 1 up to (not including) the final
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 <p>A ‘gotcha’ with array indexing is that singleton dimensions are
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 <div class="accordion-body">
 <p>An alternative way to achieve the same result is to use Numpy’s
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 <p>Since the row axis (0) is patients, it does not make sense to get the
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 <div class="accordion-body">
 <p>The shape will be <code>(60, 39)</code> because there is one fewer
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 <div class="accordion-body">
 <p>By using the <code>numpy.amax()</code> function after you apply the
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diff --git a/03-matplotlib.html b/03-matplotlib.html
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 <p>To obtain every other character you need to provide a slice with the
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 <p>The multiplication operator <code>*</code> used on a list replicates
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diff --git a/06-files.html b/06-files.html
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diff --git a/07-cond.html b/07-cond.html
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 <p>C gets printed because the first two conditions,
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 <p>There is a <a href="https://docs.python.org/3/library/functions.html#abs" class="external-link">built-in
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 </button>
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 <div class="codewrapper sourceCode" id="cb35">
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 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="codewrapper sourceCode" id="cb36">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1051,7 +1051,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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diff --git a/08-func.html b/08-func.html
index c15938b82..a69fcbeb5 100644
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diff --git a/09-errors.html b/09-errors.html
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>3 levels</li>
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 <div class="accordion-body">
 <p><code>SyntaxError</code> for missing <code>():</code> at end of first
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 <div class="accordion-body">
 <p>3 <code>NameError</code>s for <code>number</code> being misspelled,
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 <div class="accordion-body">
 <p><code>IndexError</code>; the last entry is <code>seasons[3]</code>,
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index d8f913974..25f681fd9 100644
--- a/LICENSE.html
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 <div class="accordion-body">
 <p>Creates a substring from index 1 up to (not including) the final
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 <p>A ‘gotcha’ with array indexing is that singleton dimensions are
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 <p>An alternative way to achieve the same result is to use Numpy’s
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 <div class="accordion-body">
 <p>Since the row axis (0) is patients, it does not make sense to get the
 difference between two arbitrary patients. The column axis (1) is in
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 <p>The shape will be <code>(60, 39)</code> because there is one fewer
 difference between columns than there are columns in the data.</p>
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 <p>By using the <code>numpy.amax()</code> function after you apply the
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 <div class="accordion-body">
 <p>Use negative indices to count elements from the end of a container
 (such as list or string):</p>
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 <div class="accordion-body">
 <p>To obtain every other character you need to provide a slice with the
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 <div class="accordion-body">
 <p>The multiplication operator <code>*</code> used on a list replicates
 elements of the list and concatenates them together:</p>
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 <div class="accordion-body">
 <p>C gets printed because the first two conditions,
 <code>4 &gt; 5</code> and <code>4 == 5</code>, are not true, but
@@ -4118,7 +4118,7 @@ <h3 class="callout-title">Close Enough<a class="anchor" aria-label="anchor" href
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 <p>There is a <a href="https://docs.python.org/3/library/functions.html#abs" class="external-link">built-in
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>3 levels</li>
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 <p><code>SyntaxError</code> for missing <code>():</code> at end of first
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 <p>3 <code>NameError</code>s for <code>number</code> being misspelled,
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 <div class="accordion-body">
 <p><code>IndexError</code>; the last entry is <code>seasons[3]</code>,
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 <div class="accordion-body">
 <ul>
 <li>The first assertion checks that the input sequence
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 </button>
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 </button>
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@@ -8144,7 +8144,7 @@ <h3 class="callout-title">A File-Checker<a class="anchor" aria-label="anchor" hr
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 </button>
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@@ -8208,7 +8208,7 @@ <h3 class="callout-title">Counting Lines<a class="anchor" aria-label="anchor" hr
 <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" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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@@ -8353,8 +8353,8 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
   "url": "https://swcarpentry.github.io/python-novice-inflammation/aio.html",
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   "dateCreated": "2014-11-25",
-  "dateModified": "2024-04-02",
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diff --git a/discuss.html b/discuss.html
index 6109f6b57..84334180f 100644
--- a/discuss.html
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   "dateCreated": "2014-11-25",
   "dateModified": "2023-04-21",
-  "datePublished": "2024-04-02"
+  "datePublished": "2024-04-09"
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diff --git a/extra_exercises.html b/extra_exercises.html
index 0e03682fc..77126bce2 100644
--- a/extra_exercises.html
+++ b/extra_exercises.html
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 </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">
 <p>Both examples exchange the values of <code>left</code> and
 <code>right</code>:</p>
@@ -404,7 +404,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 </button>
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@@ -556,7 +556,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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   "dateCreated": "2014-11-25",
   "dateModified": "2023-04-21",
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diff --git a/images.html b/images.html
index efe34cd6f..eee0bc8d5 100644
--- a/images.html
+++ b/images.html
@@ -516,8 +516,8 @@ <h3 id="10-defensive-figure-1">Figure 1</h3>
   "url": "https://swcarpentry.github.io/python-novice-inflammation/images.html",
   "identifier": "https://swcarpentry.github.io/python-novice-inflammation/images.html",
   "dateCreated": "2014-11-25",
-  "dateModified": "2024-04-02",
-  "datePublished": "2024-04-02"
+  "dateModified": "2024-04-09",
+  "datePublished": "2024-04-09"
 }
 
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diff --git a/index.html b/index.html
index a23d445a8..2ca36c7f9 100644
--- a/index.html
+++ b/index.html
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   <h3 class="accordion-header" id="headingSpoiler1">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Anaconda Navigator</h3>
 </button>
-<div id="collapseSpoiler1" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler1" aria-labelledby="headingSpoiler1">
+<div id="collapseSpoiler1" class="accordion-collapse collapse" aria-labelledby="headingSpoiler1" data-bs-parent="#accordionSpoiler1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Launch Anaconda Navigator. It might ask you if you’d like to send
 anonymized usage information to Anaconda developers: <img src="fig/anaconda-navigator-first-launch.png" alt="Anaconda Navigator first launch" class="figure"> Make your choice and click “Ok,
@@ -443,7 +443,7 @@ <h3 class="accordion-header" id="headingSpoiler1">
   <h3 class="accordion-header" id="headingSpoiler6">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Command line (Terminal)</h3>
 </button>
-<div id="collapseSpoiler6" class="accordion-collapse collapse" data-bs-parent="#accordionSpoiler6" aria-labelledby="headingSpoiler6">
+<div id="collapseSpoiler6" class="accordion-collapse collapse" aria-labelledby="headingSpoiler6" data-bs-parent="#accordionSpoiler6">
 <div class="accordion-body">
 <p>1. Navigate to the <code>data</code> directory:</p>
 <div id="accordionSpoiler2" class="accordion spoiler-accordion accordion-flush">
@@ -452,7 +452,7 @@ <h3 class="accordion-header" id="headingSpoiler6">
   <h3 class="accordion-header" id="headingSpoiler2">
 <div class="note-square"><i aria-hidden="true" class="callout-icon" data-feather="eye"></i></div>Unix shell</h3>
 </button>
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+<div id="collapseSpoiler2" class="accordion-collapse collapse" aria-labelledby="headingSpoiler2" data-bs-parent="#accordionSpoiler2">
 <div class="accordion-body">
 <p>If you’re using a Unix shell application, such as Terminal app in
 macOS, Console or Terminal in Linux, or <a href="https://gitforwindows.org" class="external-link">Git Bash</a> on Windows, execute the
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 <p>The shape will be <code>(60, 39)</code> because there is one fewer
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 <p>By using the <code>numpy.amax()</code> function after you apply the
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 <p>Use negative indices to count elements from the end of a container
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 <p>To obtain every other character you need to provide a slice with the
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 <p>The multiplication operator <code>*</code> used on a list replicates
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 <p>C gets printed because the first two conditions,
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 <p>There is a <a href="https://docs.python.org/3/library/functions.html#abs" class="external-link">built-in
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 <ol style="list-style-type: decimal">
 <li>3 levels</li>
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 <p><code>SyntaxError</code> for missing <code>():</code> at end of first
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 <p>3 <code>NameError</code>s for <code>number</code> being misspelled,
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 <p><code>IndexError</code>; the last entry is <code>seasons[3]</code>,
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 <div class="accordion-body">
 <ul>
 <li>The first assertion checks that the input sequence
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 <div class="accordion-body">
 <p>Both examples exchange the values of <code>left</code> and
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