diff --git a/2015/index.html b/2015/index.html
index 9806bfb..4ea6b32 100644
--- a/2015/index.html
+++ b/2015/index.html
@@ -1,4 +1,4 @@
-<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=../2018/ rel=prev><link rel=icon href=https://cdn3.iconfinder.com/data/icons/fatcow/32/asterisk_yellow.png><meta name=generator content="mkdocs-1.6.0, mkdocs-material-9.5.26"><title>Year 2015 - advent-of-code</title><link rel=stylesheet href=../assets/stylesheets/main.6543a935.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../css/timeago.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><link href=../assets/stylesheets/glightbox.min.css rel=stylesheet><style>
+<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=../2018/ rel=prev><link rel=icon href=https://cdn3.iconfinder.com/data/icons/fatcow/32/asterisk_yellow.png><meta name=generator content="mkdocs-1.6.0, mkdocs-material-9.5.27"><title>Year 2015 - advent-of-code</title><link rel=stylesheet href=../assets/stylesheets/main.6543a935.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../css/timeago.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><link href=../assets/stylesheets/glightbox.min.css rel=stylesheet><style>
     html.glightbox-open { overflow: initial; height: 100%; }
     .gslide-title { margin-top: 0px; user-select: text; }
     .gslide-desc { color: #666; user-select: text; }
@@ -55,6 +55,6 @@
 <a id=__codelineno-1-12 name=__codelineno-1-12></a>        <span class=k>break</span>
 <a id=__codelineno-1-13 name=__codelineno-1-13></a>
 <a id=__codelineno-1-14 name=__codelineno-1-14></a><span class=nb>print</span><span class=p>(</span><span class=n>i</span> <span class=o>+</span> <span class=mi>1</span><span class=p>)</span>
-</code></pre></div></td></tr></table></div> </div> </div> </div> </details> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1-2.1-2M12.5 7v5.2l4 2.4-1 1L11 13V7h1.5M11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2v1.8Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:00+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> <span class=md-source-file__fact> <span class=md-icon title=Created> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M14.47 15.08 11 13V7h1.5v5.25l3.08 1.83c-.41.28-.79.62-1.11 1m-1.39 4.84c-.36.05-.71.08-1.08.08-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8c0 .37-.03.72-.08 1.08.69.1 1.33.32 1.92.64.1-.56.16-1.13.16-1.72 0-5.5-4.5-10-10-10S2 6.5 2 12s4.47 10 10 10c.59 0 1.16-.06 1.72-.16-.32-.59-.54-1.23-.64-1.92M18 15v3h-3v2h3v3h2v-3h3v-2h-3v-3h-2Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:00+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> </aside> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../2018/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Year 2018"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Year 2018 </div> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> <div class=md-social> <a href=https://coding-armadillo.github.io/ target=_blank rel=noopener title=coding-armadillo.github.io class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 576 512"><!-- Font Awesome Free 6.5.2 by @fontawesome - 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diff --git a/2018/index.html b/2018/index.html
index eaec2c6..fcbd08f 100644
--- a/2018/index.html
+++ b/2018/index.html
@@ -1,4 +1,4 @@
-<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=../2019/ rel=prev><link href=../2015/ rel=next><link rel=icon href=https://cdn3.iconfinder.com/data/icons/fatcow/32/asterisk_yellow.png><meta name=generator content="mkdocs-1.6.0, mkdocs-material-9.5.26"><title>Year 2018 - advent-of-code</title><link rel=stylesheet href=../assets/stylesheets/main.6543a935.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../css/timeago.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><link href=../assets/stylesheets/glightbox.min.css rel=stylesheet><style>
+<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=../2019/ rel=prev><link href=../2015/ rel=next><link rel=icon href=https://cdn3.iconfinder.com/data/icons/fatcow/32/asterisk_yellow.png><meta name=generator content="mkdocs-1.6.0, mkdocs-material-9.5.27"><title>Year 2018 - advent-of-code</title><link rel=stylesheet href=../assets/stylesheets/main.6543a935.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../css/timeago.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><link href=../assets/stylesheets/glightbox.min.css rel=stylesheet><style>
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@@ -14,6 +14,6 @@
 <a id=__codelineno-0-2 name=__codelineno-0-2></a>    <span class=n>changes</span> <span class=o>=</span> <span class=p>[</span><span class=nb>int</span><span class=p>(</span><span class=n>i</span><span class=p>)</span> <span class=k>for</span> <span class=n>i</span> <span class=ow>in</span> <span class=n>f</span><span class=o>.</span><span class=n>read</span><span class=p>()</span><span class=o>.</span><span class=n>splitlines</span><span class=p>()]</span>
 <a id=__codelineno-0-3 name=__codelineno-0-3></a>
 <a id=__codelineno-0-4 name=__codelineno-0-4></a><span class=nb>print</span><span class=p>(</span><span class=nb>sum</span><span class=p>(</span><span class=n>changes</span><span class=p>))</span>
-</code></pre></div></td></tr></table></div> </div> </div> </div> </details> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1-2.1-2M12.5 7v5.2l4 2.4-1 1L11 13V7h1.5M11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2v1.8Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:01+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> <span class=md-source-file__fact> <span class=md-icon title=Created> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M14.47 15.08 11 13V7h1.5v5.25l3.08 1.83c-.41.28-.79.62-1.11 1m-1.39 4.84c-.36.05-.71.08-1.08.08-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8c0 .37-.03.72-.08 1.08.69.1 1.33.32 1.92.64.1-.56.16-1.13.16-1.72 0-5.5-4.5-10-10-10S2 6.5 2 12s4.47 10 10 10c.59 0 1.16-.06 1.72-.16-.32-.59-.54-1.23-.64-1.92M18 15v3h-3v2h3v3h2v-3h3v-2h-3v-3h-2Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:01+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> </aside> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../2019/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Year 2019"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Year 2019 </div> </div> </a> <a href=../2015/ class="md-footer__link md-footer__link--next" aria-label="Next: Year 2015"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Year 2015 </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> <div class=md-social> <a href=https://coding-armadillo.github.io/ target=_blank rel=noopener title=coding-armadillo.github.io class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 576 512"><!-- Font Awesome Free 6.5.2 by @fontawesome - 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diff --git a/2019/index.html b/2019/index.html
index ddcfec6..6d2d326 100644
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@@ -1,4 +1,4 @@
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+<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href=../2021/ rel=prev><link href=../2018/ rel=next><link rel=icon href=https://cdn3.iconfinder.com/data/icons/fatcow/32/asterisk_yellow.png><meta name=generator content="mkdocs-1.6.0, mkdocs-material-9.5.27"><title>Year 2019 - advent-of-code</title><link rel=stylesheet href=../assets/stylesheets/main.6543a935.min.css><link rel=stylesheet href=../assets/stylesheets/palette.06af60db.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style><link rel=stylesheet href=../css/timeago.css><script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script><link href=../assets/stylesheets/glightbox.min.css rel=stylesheet><style>
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@@ -16,6 +16,6 @@
 <a id=__codelineno-0-3 name=__codelineno-0-3></a>
 <a id=__codelineno-0-4 name=__codelineno-0-4></a><span class=n>fuels</span> <span class=o>=</span> <span class=p>[</span><span class=n>mass</span> <span class=o>//</span> <span class=mi>3</span> <span class=o>-</span> <span class=mi>2</span> <span class=k>for</span> <span class=n>mass</span> <span class=ow>in</span> <span class=n>data</span><span class=p>]</span>
 <a id=__codelineno-0-5 name=__codelineno-0-5></a><span class=nb>print</span><span class=p>(</span><span class=nb>sum</span><span class=p>(</span><span class=n>fuels</span><span class=p>))</span>
-</code></pre></div></td></tr></table></div> </div> </div> </div> </details> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1-2.1-2M12.5 7v5.2l4 2.4-1 1L11 13V7h1.5M11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2v1.8Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:01+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> <span class=md-source-file__fact> <span class=md-icon title=Created> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M14.47 15.08 11 13V7h1.5v5.25l3.08 1.83c-.41.28-.79.62-1.11 1m-1.39 4.84c-.36.05-.71.08-1.08.08-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8c0 .37-.03.72-.08 1.08.69.1 1.33.32 1.92.64.1-.56.16-1.13.16-1.72 0-5.5-4.5-10-10-10S2 6.5 2 12s4.47 10 10 10c.59 0 1.16-.06 1.72-.16-.32-.59-.54-1.23-.64-1.92M18 15v3h-3v2h3v3h2v-3h3v-2h-3v-3h-2Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago"><span class=timeago datetime=2024-06-10T14:25:01+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date">2024-06-10</span> </span> </aside> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../2021/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Year 2021"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Year 2021 </div> </div> </a> <a href=../2018/ class="md-footer__link md-footer__link--next" aria-label="Next: Year 2018"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Year 2018 </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> <div class=md-social> <a href=https://coding-armadillo.github.io/ target=_blank rel=noopener title=coding-armadillo.github.io class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 576 512"><!-- Font Awesome Free 6.5.2 by @fontawesome - 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index 4a2b4da..c4644e0 100644
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