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index 186cf87..bca9aec 100644
--- a/01-Image_Modalities.html
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diff --git a/02-Image_Cleanup.html b/02-Image_Cleanup.html
index 7bb32f8..95dc8e8 100644
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index ddd03f9..f89ea0b 100644
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diff --git a/04-Image_Quantification.html b/04-Image_Quantification.html
index 4253378..30fdc56 100644
--- a/04-Image_Quantification.html
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@@ -453,7 +453,7 @@ <h3 class="callout-title">Jupyter notebook challenge<a class="anchor" aria-label
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 <div class="accordion-body">
 <p>Try to switch the variable of one T1 image for another.</p>
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 <div class="accordion-body">
 <p>From the shape of the histogram we can see there is some overlap
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+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Try to explore the BIDSLayout output to find the right surface
 file.</p>
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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="accordion-body">
 <p>An algorithm expecting three tissues types may misclassify lesions as
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@@ -689,7 +689,7 @@ <h3 class="callout-title">Probability atlas threshold<a class="anchor" aria-labe
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   <h4 class="accordion-header" id="headingSolution5">Show me the solution</h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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 <div class="accordion-body">
 <p>In virtually all cases no single probability threshold will result in
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@@ -883,7 +883,7 @@ <h3 class="callout-title">Jupyter notebook challenge<a class="anchor" aria-label
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 <div class="accordion-body">
 <p>This exercise involves a change of both ROI and hemisphere.</p>
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diff --git a/05-Image_QC.html b/05-Image_QC.html
index d8e216d..6179626 100644
--- a/05-Image_QC.html
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diff --git a/06-Statistical_Analysis.html b/06-Statistical_Analysis.html
index 67a8451..4a81d31 100644
--- a/06-Statistical_Analysis.html
+++ b/06-Statistical_Analysis.html
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   "dateCreated": "2024-02-19",
   "dateModified": "2024-02-19",
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diff --git a/07-Reproducibility.html b/07-Reproducibility.html
index d7495ce..a347ad2 100644
--- a/07-Reproducibility.html
+++ b/07-Reproducibility.html
@@ -437,7 +437,7 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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   "dateCreated": "2024-02-19",
   "dateModified": "2024-02-19",
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diff --git a/404.html b/404.html
index 41561fb..040ee3f 100644
--- a/404.html
+++ b/404.html
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   "dateCreated": "2024-02-19",
-  "dateModified": "2024-02-19",
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diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index 77cc7df..a8cf18b 100644
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   "dateCreated": "2024-02-19",
   "dateModified": "2024-02-19",
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diff --git a/LICENSE.html b/LICENSE.html
index 6060da8..4e47802 100644
--- a/LICENSE.html
+++ b/LICENSE.html
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   "dateCreated": "2024-02-19",
   "dateModified": "2024-02-19",
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diff --git a/aio.html b/aio.html
index d8fcd36..287217d 100644
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 <p>Try to switch the variable of one T1 image for another.</p>
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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>From the shape of the histogram we can see there is some overlap
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-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Try to explore the BIDSLayout output to find the right surface
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@@ -1895,7 +1895,7 @@ <h3 class="callout-title">Segmentation problems in disease<a class="anchor" aria
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution4" aria-expanded="false" aria-controls="collapseSolution4">
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-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
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 <div class="accordion-body">
 <p>An algorithm expecting three tissues types may misclassify lesions as
 GM on T1 images. Filling lesions with intensity corresponding to WM is a
@@ -1974,7 +1974,7 @@ <h3 class="callout-title">Probability atlas threshold<a class="anchor" aria-labe
 <button class="accordion-button solution-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSolution5" aria-expanded="false" aria-controls="collapseSolution5">
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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">
 <div class="accordion-body">
 <p>In virtually all cases no single probability threshold will result in
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 <div class="accordion-body">
 <p>This exercise involves a change of both ROI and hemisphere.</p>
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@@ -3782,8 +3782,8 @@ <h3 class="callout-title">Key Points<a class="anchor" aria-label="anchor" href="
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diff --git a/discuss.html b/discuss.html
index 0fac2d7..13e2dfd 100644
--- a/discuss.html
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   "dateModified": "2024-02-19",
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diff --git a/images.html b/images.html
index 6a3df07..902a631 100644
--- a/images.html
+++ b/images.html
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   "dateCreated": "2024-02-19",
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diff --git a/index.html b/index.html
index 3e00662..745be81 100644
--- a/index.html
+++ b/index.html
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   "dateCreated": "2024-02-19",
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diff --git a/instructor-notes.html b/instructor-notes.html
index 8f7236b..69190e0 100644
--- a/instructor-notes.html
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diff --git a/instructor/01-Image_Modalities.html b/instructor/01-Image_Modalities.html
index 84c30fa..9515d97 100644
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   "dateModified": "2024-02-19",
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diff --git a/instructor/02-Image_Cleanup.html b/instructor/02-Image_Cleanup.html
index 5c76361..f68f7b1 100644
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diff --git a/instructor/03-Image_Spatial_Normalization.html b/instructor/03-Image_Spatial_Normalization.html
index ecff755..ddb4960 100644
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diff --git a/instructor/04-Image_Quantification.html b/instructor/04-Image_Quantification.html
index 1c070c7..1760f15 100644
--- a/instructor/04-Image_Quantification.html
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 <div class="accordion-body">
 <p>Try to switch the variable of one T1 image for another.</p>
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@@ -501,7 +501,7 @@ <h3 class="callout-title">A simple matter of thresholding ?<a class="anchor" ari
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 <div class="accordion-body">
 <p>From the shape of the histogram we can see there is some overlap
 between the tissue distributions. Segmentation on intensity alone is
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 <div class="accordion-body">
 <p>Try to explore the BIDSLayout output to find the right surface
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@@ -613,7 +613,7 @@ <h3 class="callout-title">Segmentation problems in disease<a class="anchor" aria
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 <div class="accordion-body">
 <p>An algorithm expecting three tissues types may misclassify lesions as
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 <div class="accordion-body">
 <p>In virtually all cases no single probability threshold will result in
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index 6fbcd21..688c858 100644
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index c24e47d..159bdd8 100644
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index f207ebe..8149de6 100644
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