Require Export GeoCoq.Elements.OriginalProofs.lemma_TGflip.
Require Export GeoCoq.Elements.OriginalProofs.lemma_TGsymmetric.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

(* Specifications: *)
Lemma lemma_TTflip :
forall A B C D E F G H,
TT A B C D E F G H ->
TT B A D C E F G H.