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_20 :
forall A B C D,
Par A B C D -> Cong A B C D -> TS A C B D ->
Par B C D A /\ Cong B C D A /\ TS A C B D.