subvec←{⎕IO←1           ⍝ Is ⍺ a subvector of ⍵?
    0∊⍴⍺:1              ⍝ null ⍺: success.
    0∊⍴⍵:0              ⍝ null ⍵: failure.
    (1↓⍺)(⍵⍳1↑⍺)↓⍵     ⍝ otherwise, check remaining items.
}
code_colours

test script

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