(* Gabriel Braun November 2012 *)
Require Export GeoCoq.Tarski_dev.Ch12_parallel.
Section Quadrilateral.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma bet_cong_bet :
forall A B C D,
A <> B ->
Bet A B C ->
Bet A B D ->
Cong A C B D ->
Bet B C D.