Definition T A B C : Prop := ~ (A<>B /\ B<>C /\ ~ BetH A B C).Definition ColB A B C := ~ (~ T C A B /\ ~ T A C B /\ ~ T A B C).

Lemma five_segment_B : forall A A' B B' C C' D D' : Tpoint, Cong A B A' B' -> Cong B C B' C' -> Cong A D A' D' -> Cong B D B' D' -> ~ (A <> B /\ B <> C /\ ~ BetH A B C) -> ~ (A' <> B' /\ B' <> C' /\ ~ BetH A' B' C') -> A <> B -> Cong C D C' D'.