Require Export GeoCoq.Elements.OriginalProofs.lemma_rayimpliescollinear.
Require Export GeoCoq.Elements.OriginalProofs.lemma_ray1.
Require Export GeoCoq.Elements.OriginalProofs.lemma_raystrict.
Require Export GeoCoq.Elements.OriginalProofs.lemma_9_5b.
Require Export GeoCoq.Elements.OriginalProofs.lemma_9_5a.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_sameside2 :
forall A B C E F G,
OS E F A C -> Col A B C -> Out B F G ->
OS E G A C.