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diff --git a/03-filter.html b/03-filter.html
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 <p>Because we used <code>OR</code>, a site on the South Pole for example
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 <ol style="list-style-type: decimal"><li>True because these are the same character.</li>
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diff --git a/04-calc.html b/04-calc.html
index 29bb5847..e2b52aea 100644
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diff --git a/06-agg.html b/06-agg.html
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 <p>The query produces only one row of results when we what we really
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 <p>List all the family names separated by a comma:</p>
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diff --git a/07-join.html b/07-join.html
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index 72da0d7b..8dd98657 100644
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 <p>The first example reads all the data into memory and filters the
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index ac0f86b8..80edcf34 100644
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index 55c71e91..afa9c75f 100644
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diff --git a/LICENSE.html b/LICENSE.html
index a8d1d204..96ac6d92 100644
--- a/LICENSE.html
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diff --git a/aio.html b/aio.html
index c0c88288..b2680581 100644
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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">
 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2444,7 +2444,7 @@ <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <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>Because we used <code>OR</code>, a site on the South Pole for example
 will still meet the second criteria and thus be included. Instead, we
@@ -2476,7 +2476,7 @@ <h3 class="callout-title">Finding Outliers</h3>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2532,7 +2532,7 @@ <h3 class="callout-title">Matching Patterns</h3>
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 </button>
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 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>True because these are the same character.</li>
@@ -2758,7 +2758,7 @@ <h3 class="callout-title">Fixing Salinity Readings</h3>
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-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </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="cb7">
 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4027,7 +4027,7 @@ <h3 class="callout-title">Counting Temperature Readings</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution1" aria-expanded="false" aria-controls="collapseSolution1">
   <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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@@ -4067,7 +4067,7 @@ <h3 class="callout-title">Averaging with NULL</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">
 <div class="accordion-body">
 <p>The answer is 3.0. <code>NULL</code> is not a value; it is the
 absence of a value. As such it is not included in the calculation.</p>
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 <div class="accordion-body">
 <p>The query produces only one row of results when we what we really
 want is a result for each of the readings. The <code>avg()</code>
@@ -4170,7 +4170,7 @@ <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i>
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 <p>List all the family names separated by a comma:</p>
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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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 <div class="codewrapper sourceCode" id="cb6">
 <h3 class="code-label">SQL<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="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">SQL<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="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="codewrapper sourceCode" id="cb9">
 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5694,7 +5694,7 @@ <h3 class="callout-title">Replacing NULL</h3>
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 </button>
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   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="accordion-body">
 <div class="section level4">
 <h4 id="advantages">Advantages<a class="anchor" aria-label="anchor" href="#advantages"></a>
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   <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">
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 <div class="codewrapper sourceCode" id="cb13">
 <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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   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The first example reads all the data into memory and filters the
 numbers using the if statement in Python.</p>
@@ -6578,8 +6578,8 @@ <h3 class="callout-title">Key Points</h3>
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-  "dateModified": "2024-12-24",
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diff --git a/images.html b/images.html
index 8d9dd78a..944d3070 100644
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   "dateCreated": "2014-11-21",
-  "dateModified": "2024-12-24",
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diff --git a/index.html b/index.html
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--- a/index.html
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index 6b586003..ba608a06 100644
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 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -834,7 +834,7 @@ <h3 class="callout-title">Key Points</h3>
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   <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>Because we used <code>OR</code>, a site on the South Pole for example
 will still meet the second criteria and thus be included. Instead, we
@@ -779,7 +779,7 @@ <h3 class="callout-title">Finding Outliers</h3>
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution2" aria-expanded="false" aria-controls="collapseSolution2">
   <h4 class="accordion-header" id="headingSolution2"> Show me the solution </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">SQL<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -823,7 +823,7 @@ <h3 class="callout-title">Matching Patterns</h3>
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   <h4 class="accordion-header" id="headingSolution3"> Show me the solution </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>True because these are the same character.</li>
 <li>True because the wildcard can match <em>zero</em> or more
@@ -916,7 +916,7 @@ <h3 class="callout-title">Key Points</h3>
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index e312433b..ec655761 100644
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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="cb5">
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 <p>The query produces only one row of results when we what we really
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 <p>The first example reads all the data into memory and filters the
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 <p>Because we used <code>OR</code>, a site on the South Pole for example
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 <ol style="list-style-type: decimal">
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