Section HilbertContext_2.
Context `{Hi:Hilbert_neutral_dimensionless}.
Definition Cong A B C D := (CongH A B C D /\ A <> B /\ C <> D) \/ (A = B /\ C = D).

Lemma betH_line : forall A B C, BetH A B C ->
exists l, IncidL A l /\ IncidL B l /\ IncidL C l.