Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_collinearbetween :
forall A B C D E F H,
Col A E B -> Col C F D -> neq A B -> neq C D -> neq A E -> neq F D -> ~ Meet A B C D -> BetS A H D -> Col E F H ->
BetS E H F.