Require Export GeoCoq.Elements.OriginalProofs.lemma_parallelcollinear1.
Require Export GeoCoq.Elements.OriginalProofs.lemma_tarskiparallelflip.
Require Export GeoCoq.Elements.OriginalProofs.lemma_parallelcollinear2.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_parallelcollinear :
forall A B C c d,
TP A B c d -> Col c d C -> neq C d ->
TP A B C d.