enlist←{⎕ML←1           ⍝ List ⍺-leaves of nested array.
    ⍺←0                 ⍝ default: list 0-leaves.
    ⍺≥¯1+|≡⍵:,⍵         ⍝ all shallow leaves: finished.
    1↓↑,/(⊂⊂⊃⊃⍵),⍺ ∇¨,⍵ ⍝ otherwise: concatenate sublists.
}

code_colours

test script

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