Tool of Thought I

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x*./ .=|:y           x∧.=⍉y (x i. x)=/(x i. y) (x⍳x)∘.=(x⍳y) Benchmarks:   x   800 13 character matrix   y   900 13 character matrix   x*./ .=|:y 14.6 x∧.=⍉y 3.33 (5.11) (x i. x)=/(x i. y)   1 (x⍳x)∘.=(x⍳y)   1 |:y 0.06 ⍉y 0.01