Section T11_1.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l11_14 : forall A B C A' C',
Bet A B A' -> A <> B -> A' <> B -> Bet C B C' -> B <> C -> B <> C' ->
CongA A B C A' B C'.