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_4_spec : forall A B P P',
ReflectL P P' A B ->
ReflectL P' P A B.