⍝ Insert vertex ⍵ in graph ⍺:

      a←(2 3)(3)(2 4)(1 5)(3)   ⍝ graph "a".

      disp a                
┌→──┬─┬───┬───┬─┐
│2 3│3│2 4│1 5│3│
└~─→┴─┴~─→┴~─→┴─┘

      disp a insnode 10         ⍝ ... with new node 10.
┌→──┬─┬───┬───┬─┬─┬─┬─┬─┬─┐
│2 3│3│2 4│1 5│3│0│0│0│0│0│
└~─→┴─┴~─→┴~─→┴─┴⊖┴⊖┴⊖┴⊖┴⊖┘

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