_fk←{               ⍝ Fork left.
    ⍺←⊢             ⍝ ambivalent
    ra rr←⍵         ⍝ original ra and result of f02
    (⍺ ⍺⍺ ra)⍵⍵ rr  ⍝ result of f00 becomes left arg of f01.
}

code_colours

test script

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