mscan←{                   ⍝ Minus scan.
    ⍺←⍬⍴⌽⍳⍴⍴⍵             ⍝ ⍺ is axis (default last).
    +\[⍺]⍵×[⍺](⍺⊃⍴⍵)⍴1,-1
}
code_colours

test script

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