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-<head>
-  <link href="../favicon.ico" rel="shortcut icon" type="image/x-icon"/>
-  <link href="../style.css" rel="stylesheet"/>
-  <title>BQN: Up Arrow (`↑`)</title>
-</head>
-<div class="nav">(<a href="https://github.com/mlochbaum/BQN">github</a>) / <a href="../index.html">BQN</a> / <a href="index.html">help</a></div>
-<h1 id="up-arrow-"><a class="header" href="#up-arrow-">Up Arrow (<code><span class='Function'>↑</span></code>)</a></h1>
-<p><code><span class='Function'>↑</span> <span class='Value'>𝕩</span></code>: Prefixes</p>
-<p>Prefixes of array <code><span class='Value'>𝕩</span></code> along its first axis.</p>
-<pre>   <span class='Function'>↑</span> <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>4</span>
-<span class='Bracket'>⟨</span> <span class='Bracket'>⟨⟩</span> <span class='Bracket'>⟨</span> <span class='Number'>1</span> <span class='Bracket'>⟩</span> <span class='Bracket'>⟨</span> <span class='Number'>1</span> <span class='Number'>2</span> <span class='Bracket'>⟩</span> <span class='Bracket'>⟨</span> <span class='Number'>1</span> <span class='Number'>2</span> <span class='Number'>3</span> <span class='Bracket'>⟩</span> <span class='Bracket'>⟨</span> <span class='Number'>1</span> <span class='Number'>2</span> <span class='Number'>3</span> <span class='Number'>4</span> <span class='Bracket'>⟩</span> <span class='Bracket'>⟩</span>
-   <span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Function'>↕</span><span class='Number'>9</span>
-<span class='Value'>┌─</span>       
-<span class='Value'>╵</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>  
-  <span class='Number'>3</span> <span class='Number'>4</span> <span class='Number'>5</span>  
-  <span class='Number'>6</span> <span class='Number'>7</span> <span class='Number'>8</span>  
-        <span class='Value'>┘</span>
-   <span class='Function'>↑</span> <span class='Value'>a</span>
-<span class='Value'>┌─</span>                                    
-<span class='Nothing'>·</span> <span class='Function'>↕</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Value'>┌─</span>        <span class='Value'>┌─</span>        <span class='Value'>┌─</span>         
-       <span class='Value'>╵</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>   <span class='Value'>╵</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>   <span class='Value'>╵</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>    
-               <span class='Value'>┘</span>   <span class='Number'>3</span> <span class='Number'>4</span> <span class='Number'>5</span>     <span class='Number'>3</span> <span class='Number'>4</span> <span class='Number'>5</span>    
-                         <span class='Value'>┘</span>   <span class='Number'>6</span> <span class='Number'>7</span> <span class='Number'>8</span>    
-                                   <span class='Value'>┘</span>  
-                                     <span class='Value'>┘</span>
-</pre>
-<p><code><span class='Value'>𝕨</span> <span class='Function'>↑</span> <span class='Value'>𝕩</span></code>: Take</p>
-<p>For each integer in <code><span class='Value'>𝕨</span></code>, take that many elements from each dimension of <code><span class='Value'>𝕩</span></code>.</p>
-<p>Negative numbers take from the end.</p>
-<p>If any of the elements in <code><span class='Value'>𝕨</span></code> are greater than the length of their respective dimension, the dimension is extended with a fill value.</p>
-<pre>  <span class='Number'>3</span> <span class='Function'>↑</span> <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>67</span>
-<span class='Bracket'>⟨</span> <span class='Number'>1</span> <span class='Number'>3</span> <span class='Number'>5</span> <span class='Bracket'>⟩</span>
-  <span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>4</span> <span class='Function'>⥊</span> <span class='Function'>↕</span><span class='Number'>16</span>
-<span class='Value'>┌─</span>             
-<span class='Value'>╵</span>  <span class='Number'>0</span>  <span class='Number'>1</span>  <span class='Number'>2</span>  <span class='Number'>3</span>  
-   <span class='Number'>4</span>  <span class='Number'>5</span>  <span class='Number'>6</span>  <span class='Number'>7</span>  
-   <span class='Number'>8</span>  <span class='Number'>9</span> <span class='Number'>10</span> <span class='Number'>11</span>  
-  <span class='Number'>12</span> <span class='Number'>13</span> <span class='Number'>14</span> <span class='Number'>15</span>  
-              <span class='Value'>┘</span>
-  <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-<span class='Value'>┌─</span>        
-<span class='Value'>╵</span> <span class='Number'>0</span> <span class='Number'>1</span>  <span class='Number'>2</span>  
-  <span class='Number'>4</span> <span class='Number'>5</span>  <span class='Number'>6</span>  
-  <span class='Number'>8</span> <span class='Number'>9</span> <span class='Number'>10</span>  
-         <span class='Value'>┘</span>
-  <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-<span class='Value'>┌─</span>               
-<span class='Value'>╵</span>  <span class='Number'>0</span>  <span class='Number'>1</span>  <span class='Number'>2</span>  <span class='Number'>3</span> <span class='Number'>0</span>  
-   <span class='Number'>4</span>  <span class='Number'>5</span>  <span class='Number'>6</span>  <span class='Number'>7</span> <span class='Number'>0</span>  
-   <span class='Number'>8</span>  <span class='Number'>9</span> <span class='Number'>10</span> <span class='Number'>11</span> <span class='Number'>0</span>  
-  <span class='Number'>12</span> <span class='Number'>13</span> <span class='Number'>14</span> <span class='Number'>15</span> <span class='Number'>0</span>  
-   <span class='Number'>0</span>  <span class='Number'>0</span>  <span class='Number'>0</span>  <span class='Number'>0</span> <span class='Number'>0</span>  
-                <span class='Value'>┘</span>
-  <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>¯3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-<span class='Value'>┌─</span>         
-<span class='Value'>╵</span> <span class='Number'>1</span>  <span class='Number'>2</span>  <span class='Number'>3</span>  
-  <span class='Number'>5</span>  <span class='Number'>6</span>  <span class='Number'>7</span>  
-  <span class='Number'>9</span> <span class='Number'>10</span> <span class='Number'>11</span>  
-          <span class='Value'>┘</span>
-</pre>