Ltac sTarski := auto with Tarski sTarski.Ltac esTarski := eauto with Tarski sTarski.

(* Specifications: *)
Lemma cong_transitivity : forall A B C D E F : Point, Cong A B C D -> Cong C D E F -> Cong A B E F.
Lemma cong_left_commutativity : forall A B C D, Cong A B C D -> Cong B A C D.
Lemma cong_right_commutativity : forall A B C D, Cong A B C D -> Cong A B D C.
Lemma cong_trivial_identity : forall A B : Point, Cong A A B B.
Lemma cong_reverse_identity : forall A C D, Cong A A C D -> C=D.
Lemma cong_commutativity : forall A B C D, Cong A B C D -> Cong B A D C.