⍝ ⍵-permutation of vertices of graph ⍺:

    g←(2 3)3(2 4)(1 5)3                 
    g                                   ⍝ graph "g"
┌───┬─┬───┬───┬─┐
│2 3│3│2 4│1 5│3│
└───┴─┴───┴───┴─┘
    g gperm 2 1 3 4 5                   ⍝ first two vertices reversed
┌─┬───┬───┬───┬─┐
│3│1 3│1 4│2 5│3│
└─┴───┴───┴───┴─┘
    g gperm ⌽⍳⍴g                        ⍝ all vertices reversed
┌─┬───┬───┬─┬───┐
│3│5 1│4 2│3│4 3│
└─┴───┴───┴─┴───┘

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