Section CGAdd.
Variable cg1 : CGraph1.
Variable x y : ad.
Variable d : D.
Definition cg2 := CG_add cg1 x y d.

Lemma CG_add_4_3 :
forall (x0 : ad) (d0 : D) (l : list ad),
ad_list_stutters (y :: l) = false ->
CG_path cg2 x0 d0 (y :: l) -> CG_path cg1 x0 d0 (y :: l).