colsum←{⍺←10                            ⍝ Sum of (default decimal) columns.
    ⍺{{(0=⍬⍴⍵)↓⍵}+⌿1 0⌽0,0 ⍺⊤⍵}⍣≡+⌿⍵    ⍝ repeat while overflow.
}
code_colours

test script

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