Require Export GeoCoq.Meta_theory.Decidability.equivalence_between_decidability_properties_of_basic_relations.
Section T5.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l5_5_1 : forall A B C D,
Le A B C D -> exists x, Bet A B x /\ Cong A x C D.