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 </span>⟨ "abc" ⟩
 </pre>
 <h2 id="definitions">Definitions</h2>
-<p>As discussed above, <code><span class='Function'>≍</span></code> is equivalent to <code><span class='Function'>&gt;</span><span class='Brace'>{</span><span class='Bracket'>⟨</span><span class='Value'>𝕩</span><span class='Bracket'>⟩</span><span class='Value'>;</span><span class='Bracket'>⟨</span><span class='Value'>𝕨</span><span class='Separator'>,</span><span class='Value'>𝕩</span><span class='Bracket'>⟩</span><span class='Brace'>}</span></code>. To complete the picture we should describe Merge fully. Merge is defined on an array argument <code><span class='Value'>𝕩</span></code> such that there's some shape <code><span class='Value'>s</span></code> satisfying <code><span class='Function'>∧</span><span class='Modifier'>´</span><span class='Function'>⥊</span><span class='Paren'>(</span><span class='Value'>s</span><span class='Function'>≡≢</span><span class='Paren'>)</span><span class='Modifier'>¨</span><span class='Value'>𝕩</span></code>. If <code><span class='Value'>𝕩</span></code> is empty then any shape satisfies this expression; <code><span class='Value'>s</span></code> should be chosen based on known type information for <code><span class='Value'>𝕩</span></code> or otherwise assumed to be <code><span class='Bracket'>⟨⟩</span></code>. If <code><span class='Value'>s</span></code> is empty then <code><span class='Value'>𝕩</span></code> is allowed to contain non-arrays as well as array scalars, and these will be implicitly promoted to arrays by the <code><span class='Function'>⊑</span></code> indexing used later. We construct the result by combining the outer and inner axes of the argument with Table; since the outer axes come first they must correspond to the left argument and the inner axes must correspond to the right argument. <code><span class='Value'>𝕩</span></code> is a natural choice of left argument, and because no concrete array can be used, the right argument will be <code><span class='Function'>↕</span><span class='Value'>s</span></code>, the array of indices into any element of <code><span class='Value'>𝕩</span></code>. To get the appropriate element corresponding to a particular choice of index and element of <code><span class='Value'>𝕩</span></code> we should select using that index. The result of Merge is <code><span class='Value'>𝕩</span><span class='Function'>⊑</span><span class='Modifier'>˜⌜</span><span class='Function'>↕</span><span class='Value'>s</span></code>.</p>
+<p>As discussed above, <code><span class='Function'>≍</span></code> is equivalent to <code><span class='Function'>&gt;</span><span class='Brace'>{</span><span class='Bracket'>⟨</span><span class='Value'>𝕩</span><span class='Bracket'>⟩</span><span class='Value'>;</span><span class='Bracket'>⟨</span><span class='Value'>𝕨</span><span class='Separator'>,</span><span class='Value'>𝕩</span><span class='Bracket'>⟩</span><span class='Brace'>}</span></code>. To complete the picture we should describe Merge fully. Merge is defined on an array argument <code><span class='Value'>𝕩</span></code> such that there's some shape <code><span class='Value'>s</span></code> satisfying <code><span class='Function'>∧</span><span class='Modifier'>´</span><span class='Function'>⥊</span><span class='Paren'>(</span><span class='Value'>s</span><span class='Function'>≡≢</span><span class='Paren'>)</span><span class='Modifier'>¨</span><span class='Value'>𝕩</span></code>. If <code><span class='Value'>𝕩</span></code> is empty then any shape satisfies this expression; <code><span class='Value'>s</span></code> should be chosen based on known type information for <code><span class='Value'>𝕩</span></code> or otherwise assumed to be <code><span class='Bracket'>⟨⟩</span></code>. If <code><span class='Value'>s</span></code> is empty then <code><span class='Value'>𝕩</span></code> is allowed to contain atoms as well as array scalars, and these will be implicitly promoted to arrays by the <code><span class='Function'>⊑</span></code> indexing used later. We construct the result by combining the outer and inner axes of the argument with Table; since the outer axes come first they must correspond to the left argument and the inner axes must correspond to the right argument. <code><span class='Value'>𝕩</span></code> is a natural choice of left argument, and because no concrete array can be used, the right argument will be <code><span class='Function'>↕</span><span class='Value'>s</span></code>, the array of indices into any element of <code><span class='Value'>𝕩</span></code>. To get the appropriate element corresponding to a particular choice of index and element of <code><span class='Value'>𝕩</span></code> we should select using that index. The result of Merge is <code><span class='Value'>𝕩</span><span class='Function'>⊑</span><span class='Modifier'>˜⌜</span><span class='Function'>↕</span><span class='Value'>s</span></code>.</p>
 <p>Given this definition we can also describe Rank (<code><span class='Modifier2'>⎉</span></code>) in terms of Each (<code><span class='Modifier'>¨</span></code>) and the simpler monadic function Enclose-Rank <code><span class='Function'>&lt;</span><span class='Modifier2'>⎉</span><span class='Value'>k</span></code>. We assume effective ranks <code><span class='Value'>j</span></code> for <code><span class='Value'>𝕨</span></code> (if present) and <code><span class='Value'>k</span></code> for <code><span class='Value'>𝕩</span></code> have been computed. Then the correspondence is <code><span class='Value'>𝕨</span><span class='Function'>F</span><span class='Modifier2'>⎉</span><span class='Value'>k𝕩</span> <span class='Gets'>←→</span> <span class='Function'>&gt;</span><span class='Paren'>(</span><span class='Function'>&lt;</span><span class='Modifier2'>⎉</span><span class='Value'>j𝕨</span><span class='Paren'>)</span><span class='Function'>F</span><span class='Modifier'>¨</span><span class='Paren'>(</span><span class='Function'>&lt;</span><span class='Modifier2'>⎉</span><span class='Value'>k𝕩</span><span class='Paren'>)</span></code>.</p>