fix repl redef errors

20 files changed, 93 insertions, 96 deletions

diff --git a/docs/help/classify_indexof.html b/docs/help/classify_indexof.html
index 439380a8..558b42b2 100644
--- a/docs/help/classify_indexof.html
+++ b/docs/help/classify_indexof.html
@@ -18,13 +18,12 @@
 <h2 id="---index-of"><a class="header" href="#---index-of"><code><span class='Value'>𝕨</span> <span class='Function'>⊐</span> <span class='Value'>𝕩</span></code>: Index Of</a></h2>
 <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>
-<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgNeKAvzbigL8y4oC/MuKAvzXigL8xIOKKkCA14oC/MuKAvzHigL82CgogICBhIOKGkCAz4oC/MyDipYogMOKAvzHigL8y4oC/OeKAvzDigL854oC/MOKAvzHigL8yCgogICBhIOKKkCDin6g54oC/MOKAvznin6k=">↗️</a><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>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgNeKAvzbigL8y4oC/MuKAvzXigL8xIOKKkCA14oC/MuKAvzHigL82CgogICBiIOKGkCAz4oC/MyDipYogMOKAvzHigL8y4oC/OeKAvzDigL854oC/MOKAvzHigL8yCgogICBiIOKKkCDin6g54oC/MOKAvznin6k=">↗️</a><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>
 ⟨ 0 2 5 1 ⟩
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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'>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'>b</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>
 ┌·   
 · 3  
     ┘
diff --git a/docs/help/deduplicate_find.html b/docs/help/deduplicate_find.html
index 8a57c765..411812e8 100644
--- a/docs/help/deduplicate_find.html
+++ b/docs/help/deduplicate_find.html
@@ -21,20 +21,23 @@
 <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>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgInN0cmluZyIg4o23ICJzdWJzdHJpbmciCgogICAibG9vb29vb25nIiDijbcgInNob3J0IgoKICAgYiDihpAgNyAoNHzii4bLnCnijJzil4vihpUgOQoKICAgYyDihpAgKDDigL8z4oC/MOKJjTDigL8x4oC/MCkKCiAgIGMg4o23IGI=">↗️</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='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='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'>c</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  
-    ┘
+       <span class='Value'>c</span> <span class='Function'>⍷</span> <span class='Value'>b</span>
+┌─               
+╵ 0 0 0 0 0 0 0  
+  0 0 0 0 0 0 0  
+  0 0 0 0 0 0 0  
+  0 0 1 0 0 0 1  
+  0 0 0 0 0 0 0  
+  0 0 1 0 0 0 1  
+                ┘
 </pre>
diff --git a/docs/help/first_pick.html b/docs/help/first_pick.html
index 6c829cbf..e9a5a7f7 100644
--- a/docs/help/first_pick.html
+++ b/docs/help/first_pick.html
@@ -17,12 +17,11 @@
 </pre>
 <h2 id="---pick"><a class="header" href="#---pick"><code><span class='Value'>𝕨</span> <span class='Function'>⊑</span> <span class='Value'>𝕩</span></code>: Pick</a></h2>
 <p>Pick the element of <code><span class='Value'>𝕨</span></code> at index <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=ICAgMiDiipEg4p+oMSwgMiwgM+KfqQoKICAgYSDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIDLigL8wIOKKkSBh">↗️</a><pre>       <span class='Number'>2</span> <span class='Function'>⊑</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMiDiipEg4p+oMSwgMiwgM+KfqQoKICAgYiDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIDLigL8wIOKKkSBi">↗️</a><pre>       <span class='Number'>2</span> <span class='Function'>⊑</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
 3
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊑</span> <span class='Value'>a</span>
+       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊑</span> <span class='Value'>b</span>
 6
 </pre>
diff --git a/docs/help/firstcell_select.html b/docs/help/firstcell_select.html
index 63369774..54cfd324 100644
--- a/docs/help/firstcell_select.html
+++ b/docs/help/firstcell_select.html
@@ -19,13 +19,12 @@
 </pre>
 <h2 id="---select"><a class="header" href="#---select"><code><span class='Value'>𝕨</span> <span class='Function'>⊏</span> <span class='Value'>𝕩</span></code>: Select</a></h2>
 <p>Select the major cells of <code><span class='Value'>𝕨</span></code> at the indices in <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=ICAgMuKAvzAg4oqPIOKfqDEsIDIsIDPin6kKCiAgIGEg4oaQIDPigL8zIOKliiDihpU5CgogICAy4oC/MCDiio8gYQ==">↗️</a><pre>       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMuKAvzAg4oqPIOKfqDEsIDIsIDPin6kKCiAgIGIg4oaQIDPigL8zIOKliiDihpU5CgogICAy4oC/MCDiio8gYg==">↗️</a><pre>       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
 ⟨ 3 1 ⟩
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Value'>a</span>
+       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Value'>b</span>
 ┌─       
 ╵ 6 7 8  
   0 1 2  
diff --git a/docs/help/insert.html b/docs/help/insert.html
index a00eca0e..f1d8a7dd 100644
--- a/docs/help/insert.html
+++ b/docs/help/insert.html
@@ -18,13 +18,12 @@
 <h2 id="---insert-with-initial"><a class="header" href="#---insert-with-initial"><code><span class='Value'>𝕨</span> <span class='Function'>𝔽</span><span class='Modifier'>˝</span> <span class='Value'>𝕩</span></code>: Insert With initial</a></h2>
 <p>Monadic insert, but use <code><span class='Value'>𝕨</span></code> as initial right argument.</p>
 <p>If</p>
-<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgYSDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIDHigL8x4oC/MSAry50gYQoKICAgMSAry50gYQoKICAgMOKAvzHigL8yICsgM+KAvzTigL81ICsgNuKAvzfigL84ICsgMeKAvzHigL8x">↗️</a><pre>       <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='Error'>Error: Redefinition</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgYiDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIDHigL8x4oC/MSAry50gYgoKICAgMSAry50gYgoKICAgMOKAvzHigL8yICsgM+KAvzTigL81ICsgNuKAvzfigL84ICsgMeKAvzHigL8x">↗️</a><pre>       <span class='Value'>b</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='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span> <span class='Function'>+</span><span class='Modifier'>˝</span> <span class='Value'>a</span>
+       <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span> <span class='Function'>+</span><span class='Modifier'>˝</span> <span class='Value'>b</span>
 ⟨ 10 13 16 ⟩
 
-       <span class='Number'>1</span> <span class='Function'>+</span><span class='Modifier'>˝</span> <span class='Value'>a</span>
+       <span class='Number'>1</span> <span class='Function'>+</span><span class='Modifier'>˝</span> <span class='Value'>b</span>
 ⟨ 10 13 16 ⟩
 
        <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='Function'>+</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>+</span> <span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>7</span><span class='Ligature'>‿</span><span class='Number'>8</span> <span class='Function'>+</span> <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>1</span>
diff --git a/docs/help/markfirst_memberof.html b/docs/help/markfirst_memberof.html
index 82ccf437..2b304dc2 100644
--- a/docs/help/markfirst_memberof.html
+++ b/docs/help/markfirst_memberof.html
@@ -17,18 +17,17 @@
 </pre>
 <h2 id="---member-of"><a class="header" href="#---member-of"><code><span class='Value'>𝕨</span> <span class='Function'>∊</span> <span class='Value'>𝕩</span></code>: Member Of</a></h2>
 <p>Is each element in <code><span class='Value'>𝕨</span></code> a major cell 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=ICAg4p+oMeKfqSDiiIog4oaVOQoKICAgYSDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIOKfqDDigL8x4oC/MuKfqSDiiIogYQoKICAg4p+oMeKAvzMg4qWKIDDigL8x4oC/MuKfqSDiiIogYQ==">↗️</a><pre>       <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Function'>↕</span><span class='Number'>9</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4p+oMeKfqSDiiIog4oaVOQoKICAgYiDihpAgM+KAvzMg4qWKIOKGlTkKCiAgIOKfqDDigL8x4oC/MuKfqSDiiIogYgoKICAg4p+oMeKAvzMg4qWKIDDigL8x4oC/MuKfqSDiiIogYg==">↗️</a><pre>       <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Function'>↕</span><span class='Number'>9</span>
 ⟨ 1 ⟩
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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='Bracket'>⟨</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>a</span>
+       <span class='Bracket'>⟨</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>b</span>
 ┌·   
 · 0  
     ┘
 
-       <span class='Bracket'>⟨</span><span class='Number'>1</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>a</span>
+       <span class='Bracket'>⟨</span><span class='Number'>1</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>b</span>
 ┌·   
 · 0  
     ┘
diff --git a/docs/help/prefixes_take.html b/docs/help/prefixes_take.html
index 61d27740..41b13ed7 100644
--- a/docs/help/prefixes_take.html
+++ b/docs/help/prefixes_take.html
@@ -25,32 +25,31 @@
 <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>
-<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAzIOKGkSAx4oC/M+KAvzXigL82NwoKICBhIOKGkCA04oC/NCDipYog4oaVMTYKCiAgM+KAvzMg4oaRIGEKCiAgNeKAvzUg4oaRIGEKCiAgM+KAv8KvMyDihpEgYQ==">↗️</a><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>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAzIOKGkSAx4oC/M+KAvzXigL82NwoKICBiIOKGkCA04oC/NCDipYog4oaVMTYKCiAgM+KAvzMg4oaRIGIKCiAgNeKAvzUg4oaRIGIKCiAgM+KAv8KvMyDihpEgYg==">↗️</a><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>
 ⟨ 1 3 5 ⟩
 
-      <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='Error'>Error: Redefinition</span>
+      <span class='Value'>b</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='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-┌─       
-╵ 0 1 2  
-  3 4 5  
-  6 7 8  
-        ┘
+      <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↑</span> <span class='Value'>b</span>
+┌─        
+╵ 0 1  2  
+  4 5  6  
+  8 9 10  
+         ┘
 
-      <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-┌─           
-╵ 0 1 2 0 0  
-  3 4 5 0 0  
-  6 7 8 0 0  
-  0 0 0 0 0  
-  0 0 0 0 0  
-            ┘
+      <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>↑</span> <span class='Value'>b</span>
+┌─               
+╵  0  1  2  3 0  
+   4  5  6  7 0  
+   8  9 10 11 0  
+  12 13 14 15 0  
+   0  0  0  0 0  
+                ┘
 
-      <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>¯3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
-┌─       
-╵ 0 1 2  
-  3 4 5  
-  6 7 8  
-        ┘
+      <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>¯3</span> <span class='Function'>↑</span> <span class='Value'>b</span>
+┌─         
+╵ 1  2  3  
+  5  6  7  
+  9 10 11  
+          ┘
 </pre>
diff --git a/docs/help/reverse_rotate.html b/docs/help/reverse_rotate.html
index 10b7cbb0..1060311c 100644
--- a/docs/help/reverse_rotate.html
+++ b/docs/help/reverse_rotate.html
@@ -21,13 +21,12 @@
 </pre>
 <h2 id="---dyad"><a class="header" href="#---dyad"><code><span class='Value'>𝕨</span> <span class='Function'>⌽</span> <span class='Value'>𝕩</span></code>: Dyad</a></h2>
 <p>Move the first <code><span class='Value'>𝕨</span></code> elements of <code><span class='Value'>𝕩</span></code> to its end. Negative <code><span class='Value'>𝕨</span></code> reverses the direction of rotation.</p>
-<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMiDijL0gMeKAvzLigL8zCgogICBhIOKGkCAz4oC/MyDipYog4oaVOQoKICAgMiDijL0gYQ==">↗️</a><pre>       <span class='Number'>2</span> <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>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMiDijL0gMeKAvzLigL8zCgogICBiIOKGkCAz4oC/MyDipYog4oaVOQoKICAgMiDijL0gYg==">↗️</a><pre>       <span class='Number'>2</span> <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>
 ⟨ 3 1 2 ⟩
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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='Number'>2</span> <span class='Function'>⌽</span> <span class='Value'>a</span>
+       <span class='Number'>2</span> <span class='Function'>⌽</span> <span class='Value'>b</span>
 ┌─       
 ╵ 6 7 8  
   0 1 2  
diff --git a/docs/help/suffixes_drop.html b/docs/help/suffixes_drop.html
index c581087c..1746611b 100644
--- a/docs/help/suffixes_drop.html
+++ b/docs/help/suffixes_drop.html
@@ -24,22 +24,23 @@
 <h2 id="---drop"><a class="header" href="#---drop"><code><span class='Value'>𝕨</span> <span class='Function'>↓</span> <span class='Value'>𝕩</span></code>: Drop</a></h2>
 <p>For each integer in <code><span class='Value'>𝕨</span></code>, drop that many elements from the beginning of each dimension of <code><span class='Value'>𝕩</span></code>.</p>
 <p>Negative numbers drop from the end.</p>
-<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMyDihpMgMeKAvzPigL814oC/NjcKCiAgIGEg4oaQIDTigL80IOKliiDihpUxNgoKICAgM+KAvzMg4oaTIGEKCiAgIDXigL81IOKGkyBhCgoKICAgM+KAv8KvMyDihpMgYQ==">↗️</a><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>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMyDihpMgMeKAvzPigL814oC/NjcKCiAgIGIg4oaQIDTigL80IOKliiDihpUxNgoKICAgM+KAvzMg4oaTIGIKCiAgIDXigL81IOKGkyBiCgoKICAgM+KAv8KvMyDihpMgYg==">↗️</a><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>
 ⟨ 67 ⟩
 
-       <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='Error'>Error: Redefinition</span>
+       <span class='Value'>b</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='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↓</span> <span class='Value'>a</span>
-┌┐
-└┘
+       <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↓</span> <span class='Value'>b</span>
+┌─    
+╵ 15  
+     ┘
 
-       <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='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>↓</span> <span class='Value'>b</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='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>¯3</span> <span class='Function'>↓</span> <span class='Value'>b</span>
+┌─    
+╵ 12  
+     ┘
 </pre>
diff --git a/docs/help/transpose_reorderaxes.html b/docs/help/transpose_reorderaxes.html
index 17719fdf..ce790409 100644
--- a/docs/help/transpose_reorderaxes.html
+++ b/docs/help/transpose_reorderaxes.html
@@ -23,9 +23,9 @@
 </pre>
 <h2 id="---reorder-axes"><a class="header" href="#---reorder-axes"><code><span class='Value'>𝕨</span> <span class='Function'>⍉</span> <span class='Value'>𝕩</span></code>: Reorder Axes</a></h2>
 <p>Rearrange the axes of <code><span class='Value'>𝕩</span></code> as per the axis indices in <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=ICAg4omiIGEg4oaQIDLigL8z4oC/NOKAvzXigL82IOKlijEKCiAgIOKJoiAx4oC/M+KAvzLigL8w4oC/NCDijYkgYQ==">↗️</a><pre>       <span class='Function'>≢</span> <span class='Value'>a</span> <span class='Gets'>←</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='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span> <span class='Function'>⥊</span><span class='Number'>1</span>
+<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4omiIGIg4oaQIDLigL8z4oC/NOKAvzXigL82IOKlijEKCiAgIOKJoiAx4oC/M+KAvzLigL8w4oC/NCDijYkgYg==">↗️</a><pre>       <span class='Function'>≢</span> <span class='Value'>b</span> <span class='Gets'>←</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='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span> <span class='Function'>⥊</span><span class='Number'>1</span>
 <span class='Error'>Error: Redefinition</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'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>4</span> <span class='Function'>⍉</span> <span class='Value'>a</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'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>4</span> <span class='Function'>⍉</span> <span class='Value'>b</span>
 <span class='Error'>Error: 𝕨⍉𝕩: Length of 𝕨 must not exceed rank of 𝕩</span>
 </pre>
diff --git a/help/classify_indexof.md b/help/classify_indexof.md
index 0aa3b0d6..8cef889f 100644
--- a/help/classify_indexof.md
+++ b/help/classify_indexof.md
@@ -22,9 +22,9 @@ If a cell is not found in `𝕨`, that position will contain the length of `𝕨
     
            5‿6‿2‿2‿5‿1 ⊐ 5‿2‿1‿6
 
-           a ← 3‿3 ⥊ 0‿1‿2‿9‿0‿9‿0‿1‿2
+           b ← 3‿3 ⥊ 0‿1‿2‿9‿0‿9‿0‿1‿2
 
-           a ⊐ ⟨9‿0‿9⟩
+           b ⊐ ⟨9‿0‿9⟩
 
 
     
diff --git a/help/deduplicate_find.md b/help/deduplicate_find.md
index 631638c4..168927c6 100644
--- a/help/deduplicate_find.md
+++ b/help/deduplicate_find.md
@@ -24,10 +24,10 @@ Result is the same shape as `(≢𝕨)↕x`.
 
            "loooooong" ⍷ "short"
 
-           a ← 7 (4|⋆˜)⌜○↕ 9
+           b ← 7 (4|⋆˜)⌜○↕ 9
 
-           b ← (0‿3‿0≍0‿1‿0)
+           c ← (0‿3‿0≍0‿1‿0)
 
-           b ⍷ a
+           c ⍷ b
 
     
diff --git a/help/first_pick.md b/help/first_pick.md
index c415b8f9..c85be515 100644
--- a/help/first_pick.md
+++ b/help/first_pick.md
@@ -20,8 +20,8 @@ Pick the element of `𝕨` at index `𝕩`.
     
            2 ⊑ ⟨1, 2, 3⟩
 
-           a ← 3‿3 ⥊ ↕9
+           b ← 3‿3 ⥊ ↕9
 
-           2‿0 ⊑ a
+           2‿0 ⊑ b
 
     
diff --git a/help/firstcell_select.md b/help/firstcell_select.md
index 94c82357..06cd6010 100644
--- a/help/firstcell_select.md
+++ b/help/firstcell_select.md
@@ -20,8 +20,8 @@ Select the major cells of `𝕨` at the indices in `𝕩`.
     
            2‿0 ⊏ ⟨1, 2, 3⟩
 
-           a ← 3‿3 ⥊ ↕9
+           b ← 3‿3 ⥊ ↕9
 
-           2‿0 ⊏ a
+           2‿0 ⊏ b
 
     
diff --git a/help/insert.md b/help/insert.md
index 0acfb575..b038b34f 100644
--- a/help/insert.md
+++ b/help/insert.md
@@ -19,11 +19,11 @@ Monadic insert, but use `𝕨` as initial right argument.
 
 If 
     
-           a ← 3‿3 ⥊ ↕9
+           b ← 3‿3 ⥊ ↕9
 
-           1‿1‿1 +˝ a
+           1‿1‿1 +˝ b
 
-           1 +˝ a
+           1 +˝ b
 
            0‿1‿2 + 3‿4‿5 + 6‿7‿8 + 1‿1‿1
 
diff --git a/help/markfirst_memberof.md b/help/markfirst_memberof.md
index 228d6a50..e5f38079 100644
--- a/help/markfirst_memberof.md
+++ b/help/markfirst_memberof.md
@@ -20,10 +20,10 @@ Is each element in `𝕨` a major cell of `𝕩`?
     
            ⟨1⟩ ∊ ↕9
 
-           a ← 3‿3 ⥊ ↕9
+           b ← 3‿3 ⥊ ↕9
 
-           ⟨0‿1‿2⟩ ∊ a
+           ⟨0‿1‿2⟩ ∊ b
 
-           ⟨1‿3 ⥊ 0‿1‿2⟩ ∊ a
+           ⟨1‿3 ⥊ 0‿1‿2⟩ ∊ b
 
     
diff --git a/help/prefixes_take.md b/help/prefixes_take.md
index 636574fa..6b87d124 100644
--- a/help/prefixes_take.md
+++ b/help/prefixes_take.md
@@ -24,12 +24,12 @@ If any of the elements in `𝕨` are greater than the length of their respective
     
           3 ↑ 1‿3‿5‿67
 
-          a ← 4‿4 ⥊ ↕16
+          b ← 4‿4 ⥊ ↕16
 
-          3‿3 ↑ a
+          3‿3 ↑ b
 
-          5‿5 ↑ a
+          5‿5 ↑ b
 
-          3‿¯3 ↑ a
+          3‿¯3 ↑ b
 
     
diff --git a/help/reverse_rotate.md b/help/reverse_rotate.md
index a7ec430b..0eedfc62 100644
--- a/help/reverse_rotate.md
+++ b/help/reverse_rotate.md
@@ -20,8 +20,8 @@ Move the first `𝕨` elements of `𝕩` to its end. Negative `𝕨` reverses th
     
            2 ⌽ 1‿2‿3
 
-           a ← 3‿3 ⥊ ↕9
+           b ← 3‿3 ⥊ ↕9
 
-           2 ⌽ a
+           2 ⌽ b
 
     
diff --git a/help/suffixes_drop.md b/help/suffixes_drop.md
index 10c93520..a513f8db 100644
--- a/help/suffixes_drop.md
+++ b/help/suffixes_drop.md
@@ -22,13 +22,13 @@ Negative numbers drop from the end.
     
            3 ↓ 1‿3‿5‿67
 
-           a ← 4‿4 ⥊ ↕16
+           b ← 4‿4 ⥊ ↕16
 
-           3‿3 ↓ a
+           3‿3 ↓ b
 
-           5‿5 ↓ a
+           5‿5 ↓ b
 
 
-           3‿¯3 ↓ a
+           3‿¯3 ↓ b
 
     
diff --git a/help/transpose_reorderaxes.md b/help/transpose_reorderaxes.md
index 72060ce2..d26664a5 100644
--- a/help/transpose_reorderaxes.md
+++ b/help/transpose_reorderaxes.md
@@ -20,8 +20,8 @@ Move the first axis of `𝕩` to the end.
     
 Rearrange the axes of `𝕩` as per the axis indices in `𝕨`.
     
-           ≢ a ← 2‿3‿4‿5‿6 ⥊1
+           ≢ b ← 2‿3‿4‿5‿6 ⥊1
 
-           ≢ 1‿3‿2‿0‿4 ⍉ a
+           ≢ 1‿3‿2‿0‿4 ⍉ b