Section T10.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Goal forall A B C D, ~ Coplanar D C B A -> ~ Coplanar A B C D.

Lemma l10_14 : forall P P' A B, P <> P' -> A <> B ->
Reflect P P' A B -> TS A B P P'.