eis←{                   ⍝ enclose-if-simple / link
    0≠⎕NC'⍺':(∇ ⍺),∇ ⍵  ⍝ dyadic: link
    {⊂1/⍵}⍣(1=≡,⍵)⊢⍵    ⍝ monadic: enclose if simple
}
code_colours

test script

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