diff --git a/01-introduction.html b/01-introduction.html
index 2dba1d4..655011e 100644
--- a/01-introduction.html
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diff --git a/02-basics.html b/02-basics.html
index 03198d0..3b5b1c7 100644
--- a/02-basics.html
+++ b/02-basics.html
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 </button>
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 <ol style="list-style-type: decimal"><li>Only the last result is printed.</li>
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 <p>Type ‘print’ into a code cell and then type
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@@ -1082,7 +1082,7 @@ <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"><
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 <p>0 is represented as False and everything else, whether a number or
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 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="codewrapper sourceCode" id="cb42">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1263,7 +1263,7 @@ <h3 class="callout-title">Exercise</h3>
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <div class="codewrapper sourceCode" id="cb47">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1367,7 +1367,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/03-control-structures.html b/03-control-structures.html
index fe009cd..c289fee 100644
--- a/03-control-structures.html
+++ b/03-control-structures.html
@@ -553,7 +553,7 @@ <h3 class="callout-title">Exercise</h3>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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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">
 <ol style="list-style-type: decimal"><li>Because i is incremented before the sum, you are summing 1 to
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diff --git a/04-reusable.html b/04-reusable.html
index 745e856..6fd59d2 100644
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 </button>
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 <div class="accordion-body">
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diff --git a/05-processing-data-from-file.html b/05-processing-data-from-file.html
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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diff --git a/07-json.html b/07-json.html
index 03f7563..549bd95 100644
--- a/07-json.html
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+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <ul><li>
 <code>d</code> is a list of dictionaries</li>
@@ -975,7 +975,7 @@ <h3 class="callout-title">Key Points</h3>
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diff --git a/08-Pandas.html b/08-Pandas.html
index a9d5493..d013845 100644
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diff --git a/09-extracting-data.html b/09-extracting-data.html
index 21bee8a..94365b5 100644
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   <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">
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@@ -577,7 +577,7 @@ <h3 class="callout-title">Exercise</h3>
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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diff --git a/10-aggregations.html b/10-aggregations.html
index 9caea6d..102398d 100644
--- a/10-aggregations.html
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>We know from when we originally displayed the contents of the
 <code>df_SAFI</code> Dataframe that there are 131 rows in it. This
@@ -751,7 +751,7 @@ <h3 class="callout-title">Exercise</h3>
 <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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diff --git a/11-joins.html b/11-joins.html
index 0a4abb5..4610c54 100644
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diff --git a/12-long-and-wide.html b/12-long-and-wide.html
index c8dba29..761a652 100644
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <ol style="list-style-type: decimal"><li>Read in Newspapers.csv file and keep only the dailies.</li>
 </ol><div class="codewrapper sourceCode" id="cb15">
@@ -749,7 +749,7 @@ <h3 class="callout-title">Key Points</h3>
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   "dateCreated": "2023-05-04",
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diff --git a/13-matplotlib.html b/13-matplotlib.html
index 2a31479..393062b 100644
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index 21aaac0..b8f1874 100644
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diff --git a/404.html b/404.html
index 721e72f..2c07af1 100644
--- a/404.html
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diff --git a/AUTHORS.html b/AUTHORS.html
index 3a38e19..2ebc3e4 100644
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index 81dca22..8d2b134 100644
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diff --git a/LICENSE.html b/LICENSE.html
index d7f6fd9..efbf9f0 100644
--- a/LICENSE.html
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 <ol style="list-style-type: decimal">
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diff --git a/images.html b/images.html
index 91babde..378c0e0 100644
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 <ol style="list-style-type: decimal"><li>We know from when we originally displayed the contents of the
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index aa3fd01..4642fc2 100644
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 <li>Read in Newspapers.csv file and keep only the dailies.</li>
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diff --git a/pkgdown.yml b/pkgdown.yml
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