Hint Resolve between_exchange2 outer_transitivity_between between_exchange4 : between.
Section T2_4.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l3_17 : forall A B C A' B' P,
Bet A B C -> Bet A' B' C -> Bet A P A' -> exists Q, Bet P Q C /\ Bet B Q B'.