case←{              ⍝ Select statement
    ~∨/b←<\⍺:⍵      ⍝ none
    ¯1↑b:⍵⍵ ⍵       ⍝ last one
    1 0≡b:⍺⍺ ⍵      ⍝ first of two
    (¯1↓b)⍺⍺ ⍵      ⍝ penultimate?
}

code_colours

test script

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