packU←{⎕IO←0     ⍝ Unique packer.

    cmp←{
        u←∪,⍵
        (⍴⍵)u(u⍳,⍵)
    }

    exp←{
        (0⊃⍵)(1⊃⍵)[2⊃⍵]
    }

    ⍺←1 ⋄ ⍺:cmp ⍵ ⋄ exp ⍵
}
code_colours

test script

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