until←{         ⍝ Conditional function power.
    ⍺⍺{         ⍝ sub-operator for initial application:
        ⍵⍵ ⍵:⍵  ⍝ Until ⍵⍵,
        ∇ ⍺⍺ ⍵  ⍝ Apply ⍺⍺ ⍺⍺ ...
    }⍵⍵ ⍺⍺ ⍵    ⍝ initial application.
}

code_colours

test script

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