Require Export GeoCoq.Elements.OriginalProofs.lemma_congruencetransitive.
Section Euclid.
Context `{Ax:euclidean_neutral}.

(* Specifications: *)
Lemma lemma_congruenceflip :
forall A B C D,
Cong A B C D ->
Cong B A D C /\ Cong B A C D /\ Cong A B D C.