for←{                       ⍝ Multiple selection of function list.
    (¯1↓⍺)⍺⍺{1≠⍴⍺:⍺ ⍺⍺ ⍵    ⍝ next left ...
        (⍺⍺⍣(⊃⍺))⍵          ⍝ if last call and first ⍺:⍺⍺ ⍵
    }(⍵⍵⍣(⊃⌽⍺))⍵            ⍝ if last ⍺:⍵⍵ ⍵
}

code_colours

test script

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