remnode←{               ⍝ Remove vertex ⍵ from graph ⍺.
    new←(⍵≠⍳⍴⍺)/⍺~¨⍵    ⍝ graph with vertex ⍵ removed,
    new-new>⍵           ⍝ and edges adjusted.
}

code_colours

test script

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