eapply l7_15.
2: apply H.
2: apply H0.
2: apply H1.
apply l7_3_2.
Qed.

(* Specifications: *)
Lemma symmetry_preseves_bet2 : forall A B M A' B', Midpoint M A A' -> Midpoint M B B' -> Bet M A' B' -> Bet M A B.
intros.