Require Export GeoCoq.Meta_theory.Parallel_postulates.parallel_postulates.
Require Export GeoCoq.Meta_theory.Parallel_postulates.par_trans_NID.
Section T13.
Context `{TE:Tarski_euclidean}.

Lemma l12_22 :
forall A B C D P,
Out P A C -> OS P A B D ->
(CongA B A P D C P <-> Par A B C D).