ascana{⎕ML←1                   ⍝ Higher rank asscociative scan.
    ⍺←⍬⍴⌽⍳⍴⍴⍵                   ⍝ default last axis.
    ↑[⍺-0.1](⍺⍺ ascan)¨↓[⍺]⍵
}
code_colours

test script

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