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

Lemma CG_add_4_5 :
forall (d0 : D) (l : list ad),
ad_list_stutters (l ++ x :: nil) = false ->
CG_path cg2 x d0 (l ++ x :: nil) -> CG_path cg1 x d0 (l ++ x :: nil).