acc{                                   ⍝ Accumulating reduction.
    ⊃⍺⍺{(⊂⍺ ⍺⍺⊃⍬⍴⍵),⍵}/1↓{⍵,⊂⍬⍴⍵}¯1⌽⍵
}
code_colours

test script

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