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 <p>R will construct column headers from values in your first row of
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 <ol style="list-style-type: decimal"><li><p><code>animal[4:1]</code></p></li>
 <li><p><code>"o" "n" "k" "e" "y"</code> and
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 <p>Answer: 3</p>
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <p>Correct solution is <strong>d.</strong></p>
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   </h4>
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <p><code>dat$Gender</code> has 4 levels, so the plot shows 4 levels.</p>
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index 35674fac..83c5fc41 100644
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-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="accordion-body">
 <p>All vectors are one-dimensional and each element is of the same
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   </h4>
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 <div class="accordion-body">
 <p>We know that <code>typeof(FOURS)</code> will also return
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-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="accordion-body">
 <p>The weight column is numeric while group is a factor. Lists can have
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index bdcd71c8..01b720fe 100644
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index 9a2f472e..4ac3c5e4 100644
--- a/LICENSE.html
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-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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-<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><p>The solution is <code>a.</code>.</p></li>
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   </h4>
 </button>
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 <div class="accordion-body">
 <p>An error message is returned due to “invalid input.” This is likely
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 <p><code>dat$Gender</code> has 4 levels, so the plot shows 4 levels.</p>
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 <p>All vectors are one-dimensional and each element is of the same
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 <p>We know that <code>typeof(FOURS)</code> will also return
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 <ol style="list-style-type: decimal"><li><p><code>animal[4:1]</code></p></li>
 <li><p><code>"o" "n" "k" "e" "y"</code> and
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diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 41fdeb7a..4f98add3 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -396,7 +396,7 @@ <h1>Contributor Code of Conduct</h1>
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diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 9588b693..de81f28c 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -447,7 +447,7 @@ <h1>Licenses</h1>
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   "dateCreated": "2014-12-18",
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diff --git a/instructor/aio.html b/instructor/aio.html
index 487f5656..d16f2a18 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -574,7 +574,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </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">
 <div class="accordion-body">
 <p>R will construct column headers from values in your first row of
 data, resulting in <code>X0 X0.1 X1 X3 X1.1 X2 ...</code>.</p>
@@ -610,7 +610,7 @@ <h4 class="accordion-header" id="headingSolution2">
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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   Show me the solution
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p><code>animal[4:1]</code></p></li>
@@ -1477,7 +1477,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>Answer: 3</p>
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <div class="codewrapper sourceCode" id="cb74">
 <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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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="codewrapper sourceCode" id="cb14">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="accordion-body">
 <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>
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>The solution is <code>a.</code>.</p></li>
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 </button>
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 </button>
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <p>An error message is returned due to “invalid input.” This is likely
 because ‘*’ has a special meaning in the shell, as a wildcard.</p>
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-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 </button>
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The code for such a plot:</li>
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 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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@@ -7668,7 +7668,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 <div class="accordion-body">
 <p>Correct solution is <strong>d.</strong></p>
 <div class="codewrapper sourceCode" id="cb16">
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -8265,7 +8265,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <p><code>dat$Gender</code> has 4 levels, so the plot shows 4 levels.</p>
 </div>
@@ -8895,7 +8895,7 @@ <h4 class="accordion-header" id="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="accordion-body">
 <p>All vectors are one-dimensional and each element is of the same
 type.</p>
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <p>We know that <code>typeof(FOURS)</code> will also return
 <code>"double"</code> since matrices are made of elements of the same
@@ -9226,7 +9226,7 @@ <h4 class="accordion-header" id="headingSolution3">
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 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <ol style="list-style-type: decimal">
 <li>
@@ -9320,7 +9320,7 @@ <h4 class="accordion-header" id="headingSolution4">
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index 4ef1005b..e6f7280f 100644
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