Require Export GeoCoq.Elements.OriginalProofs.lemma_parallelNC.
Require Export GeoCoq.Elements.OriginalProofs.lemma_NCdistinct.
Require Export GeoCoq.Elements.OriginalProofs.lemma_parallelflip.
Require Export GeoCoq.Elements.OriginalProofs.lemma_collinearparallel.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_collinearparallel2 :
forall A B C D E F,
Par A B C D -> Col C D E -> Col C D F -> neq E F ->
Par A B E F.