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   tm ← {⍎,0 1↓(≠\∧⌿t∊'→|')/t←(¯2↑1,⍴⍵)⍴⍵}

   tm cmpx '+/○⍳1e6' '+/⌽○⍳1e6'
0.0156 0.022

   tm cmpx '+/○⍳1e6'
0.0161