Section T4_4.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma NCol_perm :
forall A B C,
~ Col A B C ->
~ Col A B C /\ ~ Col A C B /\ ~ Col B A C /\
~ Col B C A /\ ~ Col C A B /\ ~ Col C B A.