Require Export GeoCoq.Elements.OriginalProofs.lemma_NCdistinct.
Require Export GeoCoq.Elements.OriginalProofs.lemma_NChelper.
Section Euclid.
Context `{Ax1:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_samesidecollinear :
forall A B C P Q,
OS P Q A B -> Col A B C -> neq A C ->
OS P Q A C.