Require Export GeoCoq.Elements.OriginalProofs.lemma_collinearorder.
Section Euclid.
Context `{Ax:euclidean_neutral}.

(* Specifications: *)
Lemma lemma_parallelNC :
forall A B C D,
Par A B C D ->
nCol A B C /\ nCol A C D /\ nCol B C D /\ nCol A B D.