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-<head>
-  <link href="../favicon.ico" rel="shortcut icon" type="image/x-icon"/>
-  <link href="../style.css" rel="stylesheet"/>
-  <title>BQN: Square Original Of (`⊐`)</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="square-original-of-"><a class="header" href="#square-original-of-">Square Original Of (<code><span class='Function'>⊐</span></code>)</a></h1>
-<p><code><span class='Function'>⊐</span> <span class='Value'>𝕩</span></code>: Classify</p>
-<p>First index of each major cell of <code><span class='Value'>𝕩</span></code> in <code><span class='Value'>𝕩</span></code>.</p>
-<pre>   <span class='Function'>⊐</span> <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>1</span>
-<span class='Bracket'>⟨</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span> <span class='Number'>2</span> <span class='Number'>0</span> <span class='Number'>3</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='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</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'>9</span> <span class='Number'>0</span> <span class='Number'>9</span>  
-  <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>  
-        <span class='Value'>┘</span>
-   <span class='Function'>⊐</span> <span class='Value'>a</span>
-<span class='Bracket'>⟨</span> <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>0</span> <span class='Bracket'>⟩</span>
-</pre>
-<p><code><span class='Value'>𝕨</span> <span class='Function'>⊐</span> <span class='Value'>𝕩</span></code>: Index Of</p>
-<p>First index of each major cell of <code><span class='Value'>𝕩</span></code> in <code><span class='Value'>𝕨</span></code>. Rank of <code><span class='Value'>𝕩</span></code> must be at least cell rank of 𝕨`.</p>
-<p>If a cell is not found in <code><span class='Value'>𝕨</span></code>, that position will contain the length of <code><span class='Value'>𝕨</span></code> (<code><span class='Function'>≠</span><span class='Value'>𝕨</span></code>).</p>
-<pre>   <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>1</span> <span class='Function'>⊐</span> <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>6</span>
-<span class='Bracket'>⟨</span> <span class='Number'>0</span> <span class='Number'>2</span> <span class='Number'>5</span> <span class='Number'>1</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='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</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'>9</span> <span class='Number'>0</span> <span class='Number'>9</span>  
-  <span class='Number'>0</span> <span class='Number'>1</span> <span class='Number'>2</span>  
-        <span class='Value'>┘</span>
-   <span class='Value'>a</span> <span class='Function'>⊐</span> <span class='Bracket'>⟨</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Bracket'>⟩</span>
-<span class='Value'>┌</span><span class='Nothing'>·</span>   
-<span class='Nothing'>·</span> <span class='Number'>3</span>  
-    <span class='Value'>┘</span>
-</pre>