Require Export GeoCoq.Tarski_dev.Ch05_bet_le.
Ltac eCol := eauto with col.
Section T6_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l6_2 : forall A B C P,  A<>P -> B<>P -> C<>P -> Bet A P C -> (Bet B P C <-> Out P A B).