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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 Down 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-down-arrow-"><a class="header" href="#up-down-arrow-">Up Down Arrow (<code><span class='Function'>↕</span></code>)</a></h1>
+<h2 id="--range--"><a class="header" href="#--range--"><code><span class='Function'>↕</span> <span class='Value'>𝕩</span></code>: Range</a></h2>
+<p>Return all indices to index into an array of shape <code><span class='Value'>𝕩</span></code>, in the shape described by <code><span class='Value'>𝕩</span></code>.</p>
+<p>When given a single number, range from 0 to <code><span class='Value'>𝕩</span><span class='Function'>-</span><span class='Number'>1</span></code>.</p>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4oaVIDQKCiAgIOKGlSA04oC/NQ==">↗️</a><pre>       <span class='Function'>↕</span> <span class='Number'>4</span>
+⟨ 0 1 2 3 ⟩
+
+       <span class='Function'>↕</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>5</span>
+┌─                                         
+╵ ⟨ 0 0 ⟩ ⟨ 0 1 ⟩ ⟨ 0 2 ⟩ ⟨ 0 3 ⟩ ⟨ 0 4 ⟩  
+  ⟨ 1 0 ⟩ ⟨ 1 1 ⟩ ⟨ 1 2 ⟩ ⟨ 1 3 ⟩ ⟨ 1 4 ⟩  
+  ⟨ 2 0 ⟩ ⟨ 2 1 ⟩ ⟨ 2 2 ⟩ ⟨ 2 3 ⟩ ⟨ 2 4 ⟩  
+  ⟨ 3 0 ⟩ ⟨ 3 1 ⟩ ⟨ 3 2 ⟩ ⟨ 3 3 ⟩ ⟨ 3 4 ⟩  
+                                          ┘
+</pre>
+<h2 id="---windows"><a class="header" href="#---windows"><code><span class='Value'>𝕨</span> <span class='Function'>↕</span> <span class='Value'>𝕩</span></code>: Windows</a></h2>
+<p>Overlapping slices of <code><span class='Value'>𝕩</span></code> which are of shape <code><span class='Value'>𝕨</span></code>.</p>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgNSDihpUgImFiY2RlZmciCgogICBhIOKGkCAz4oC/M+KliuKGlTkKCiAgIDLigL8yIOKGlSBh">↗️</a><pre>       <span class='Number'>5</span> <span class='Function'>↕</span> <span class='String'>&quot;abcdefg&quot;</span>
+┌─       
+╵"abcde  
+  bcdef  
+  cdefg" 
+        ┘
+
+       <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'>9</span>
+
+       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>2</span> <span class='Function'>↕</span> <span class='Value'>a</span>
+┌─     
+┆ 0 1  
+  3 4  
+       
+  1 2  
+  4 5  
+       
+       
+  3 4  
+  6 7  
+       
+  4 5  
+  7 8  
+      ┘
+</pre>