diff --git a/404.html b/404.html
index 6419bfc..f174df0 100644
--- a/404.html
+++ b/404.html
@@ -264,8 +264,8 @@ <h1>Page not found</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/404.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/404.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index 010764e..20f9d46 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -296,7 +296,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/CODE_OF_CONDUCT.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index f82155f..3858f3f 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -347,7 +347,7 @@ <h1>Licenses</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/LICENSE.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/aio.html b/aio.html
index 5055b6f..7646a4b 100644
--- a/aio.html
+++ b/aio.html
@@ -320,7 +320,7 @@ <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>Using <code>ftn</code>:</p>
 <pre class="shell"><code>$ something something something</code></pre>
@@ -492,7 +492,7 @@ <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>A version of this program is available as
 <code>exercise1.f90</code>.</p>
@@ -570,8 +570,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/aio.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/aio.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/images.html b/images.html
index 320f281..b813698 100644
--- a/images.html
+++ b/images.html
@@ -294,8 +294,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/images.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/images.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/index.html b/index.html
index 66992b6..5db6488 100644
--- a/index.html
+++ b/index.html
@@ -388,8 +388,8 @@ <h4 class="accordion-header" id="headingSolution2">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/index.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/index.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor-notes.html b/instructor-notes.html
index c9f1fc4..9076b69 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -301,8 +301,8 @@ <h1>Instructor Notes</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor-notes.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor-notes.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/404.html b/instructor/404.html
index a90ed33..5ee5bbf 100644
--- a/instructor/404.html
+++ b/instructor/404.html
@@ -264,8 +264,8 @@ <h1>Page not found</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/404.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/404.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index c0a547f..76f12b6 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -297,7 +297,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/CODE_OF_CONDUCT.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 70e211f..23fb014 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -348,7 +348,7 @@ <h1>Licenses</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/LICENSE.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/aio.html b/instructor/aio.html
index 1dab0ac..ae6dc26 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -319,7 +319,7 @@ <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>Using <code>ftn</code>:</p>
 <pre class="shell"><code>$ something something something</code></pre>
@@ -491,7 +491,7 @@ <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>A version of this program is available as
 <code>exercise1.f90</code>.</p>
@@ -569,8 +569,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/aio.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/aio.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/images.html b/instructor/images.html
index 00e2af7..a993551 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -292,8 +292,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/images.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/images.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index 8ef8263..fb8b62d 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -403,8 +403,8 @@ <h4 class="accordion-header" id="headingSolution2">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/index.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/index.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 506d96b..ab94f30 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -300,8 +300,8 @@ <h1>Instructor Notes</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/instructor-notes.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/instructor-notes.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/introduction.html b/instructor/introduction.html
index 0ee8c71..e323907 100644
--- a/instructor/introduction.html
+++ b/instructor/introduction.html
@@ -301,7 +301,7 @@ <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>Using <code>ftn</code>:</p>
 <pre class="shell"><code>$ something something something</code></pre>
@@ -467,7 +467,7 @@ <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>A version of this program is available as
 <code>exercise1.f90</code>.</p>
@@ -554,7 +554,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/introduction.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index abd09b5..1ee23e1 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -298,8 +298,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/key-points.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/key-points.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index 647963d..2953a6c 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -248,8 +248,8 @@ <h1>Learner Profiles</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/profiles.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/profiles.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index 54dc62e..b67f3dd 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -290,7 +290,7 @@ <h1>Reference</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/instructor/reference.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/introduction.html b/introduction.html
index 160993e..92cebdf 100644
--- a/introduction.html
+++ b/introduction.html
@@ -300,7 +300,7 @@ <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>Using <code>ftn</code>:</p>
 <pre class="shell"><code>$ something something something</code></pre>
@@ -466,7 +466,7 @@ <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>A version of this program is available as
 <code>exercise1.f90</code>.</p>
@@ -553,7 +553,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/introduction.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index 1a26fe7..b623b99 100644
--- a/key-points.html
+++ b/key-points.html
@@ -300,8 +300,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/key-points.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/key-points.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index 6a9ad85..a411122 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2023-10-24T00:46Z
+last_built: 2023-10-31T00:45Z
 
diff --git a/profiles.html b/profiles.html
index 64e1983..dd5aa93 100644
--- a/profiles.html
+++ b/profiles.html
@@ -249,8 +249,8 @@ <h1>Learner Profiles</h1>
   "url": "https://astroDimitrios.github.io/intro-to-modern-fortran/profiles.html",
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/profiles.html",
   "dateCreated": "2023-08-04",
-  "dateModified": "2023-10-24",
-  "datePublished": "2023-10-24"
+  "dateModified": "2023-10-31",
+  "datePublished": "2023-10-31"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index a1db8a5..939cc30 100644
--- a/reference.html
+++ b/reference.html
@@ -289,7 +289,7 @@ <h1>Reference</h1>
   "identifier": "https://astroDimitrios.github.io/intro-to-modern-fortran/reference.html",
   "dateCreated": "2023-08-04",
   "dateModified": "2023-08-15",
-  "datePublished": "2023-10-24"
+  "datePublished": "2023-10-31"
 }
 
   </script><script>