Require Export GeoCoq.Elements.OriginalProofs.lemma_NChelper.
Require Export GeoCoq.Elements.OriginalProofs.lemma_NCorder.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_parallelcollinear2 :
forall A B C c d,
TP A B c d -> BetS c C d ->
TP A B C d.