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+<head>
+  <link href="../favicon.ico" rel="shortcut icon" type="image/x-icon"/>
+  <link href="../style.css" rel="stylesheet"/>
+  <title>BQN: Epsilon Underbar (`⍷`)</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="epsilon-underbar-"><a class="header" href="#epsilon-underbar-">Epsilon Underbar (<code><span class='Function'>⍷</span></code>)</a></h1>
+<h2 id="--deduplicate"><a class="header" href="#--deduplicate"><code><span class='Function'>⍷</span> <span class='Value'>𝕩</span></code>: Deduplicate</a></h2>
+<p>Unique major cells of <code><span class='Value'>𝕩</span></code>.</p>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4o23IDTigL814oC/NuKAvzbigL804oC/N+KAvzUKCiAgIGEg4oaQIDPigL8zIOKliiDihpU2CgogICDijbcgYQ==">↗️</a><pre>       <span class='Function'>⍷</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>7</span><span class='Ligature'>‿</span><span class='Number'>5</span>
+⟨ 4 5 6 7 ⟩
+
+       <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'>6</span>
+
+       <span class='Function'>⍷</span> <span class='Value'>a</span>
+┌─       
+╵ 0 1 2  
+  3 4 5  
+        ┘
+</pre>
+<h2 id="---find"><a class="header" href="#---find"><code><span class='Value'>𝕨</span> <span class='Function'>⍷</span> <span class='Value'>𝕩</span></code>: Find</a></h2>
+<p>Mark the top left location of the occurrences of <code><span class='Value'>𝕨</span></code> in <code><span class='Value'>𝕩</span></code> with a 1, and other locations with 0.</p>
+<p>Result is the same shape as <code><span class='Paren'>(</span><span class='Function'>≢</span><span class='Value'>𝕨</span><span class='Paren'>)</span><span class='Function'>↕</span><span class='Value'>x</span></code>.</p>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgInN0cmluZyIg4o23ICJzdWJzdHJpbmciCgogICAibG9vb29vb25nIiDijbcgInNob3J0IgoKICAgYSDihpAgNyAoNHzii4bLnCnijJzil4vihpUgOQoKICAgYiDihpAgKDDigL8z4oC/MOKJjTDigL8x4oC/MCkKCiAgIGIg4o23IGE=">↗️</a><pre>       <span class='String'>&quot;string&quot;</span> <span class='Function'>⍷</span> <span class='String'>&quot;substring&quot;</span>
+⟨ 0 0 0 1 ⟩
+
+       <span class='String'>&quot;loooooong&quot;</span> <span class='Function'>⍷</span> <span class='String'>&quot;short&quot;</span>
+⟨⟩
+
+       <span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>7</span> <span class='Paren'>(</span><span class='Number'>4</span><span class='Function'>|⋆</span><span class='Modifier'>˜</span><span class='Paren'>)</span><span class='Modifier'>⌜</span><span class='Modifier2'>○</span><span class='Function'>↕</span> <span class='Number'>9</span>
+<span class='Error'>Error: Redefinition</span>
+
+       <span class='Value'>b</span> <span class='Gets'>←</span> <span class='Paren'>(</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>0</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'>0</span><span class='Paren'>)</span>
+
+       <span class='Value'>b</span> <span class='Function'>⍷</span> <span class='Value'>a</span>
+┌─   
+╵ 0  
+  0  
+    ┘
+</pre>