;; Removing Vertices and Edges
;;

(define bg (graph '(1 2 3 4 5 6) '((1 2) (2 3) (3 1) (5 6) (5 6) (5 6))))

(remove-vertex! 1 bg)

(remove-vertices! 2 4 bg) ; specify an integer range of vertices to delete

(describe bg)

(remove-edges! '((5 6)) bg)  ; bogus edges ignored

(describe bg)
