End HilbertContext_2.
Ltac out_exists A B X := try match goal with |H : A <> B |- _
=> assert(HH:=between_out A B H);auto; destruct HH as [X]
end.
Ltac not_on_line A B X :=  try match goal with |H : A <> B |- _
=> assert(HH:=ncolH_exists A B H);auto; destruct HH as [X]
end.
Hint Resolve betH_trans0 betH_trans1 betH2_out out2_out : bet.
Hint Resolve congH_sym congH_perm congH_perml cong_permr congH_refl
cong_pseudo_transitivity congH_perms: cong.
Ltac Cong := eauto 3 with cong.
Section HilbertContext_2D.
Context `{H2D : Hilbert_neutral_2D}.

Lemma upper_dim : forall A B C P Q,
P <> Q -> A <> B -> A <> C -> B <> C ->
Cong A P A Q -> Cong B P B Q -> Cong C P C Q ->
(Bet A B C \/ Bet B C A \/ Bet C A B).