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_6 : forall A B C D A' B' C' D',
Le A B C D -> Cong A B A' B' -> Cong C D C' D' -> Le A' B' C' D'.