Require Export GeoCoq.Elements.OriginalProofs.lemma_extension.
Require Export GeoCoq.Elements.OriginalProofs.lemma_lessthancongruence2.
Section Euclid.
Context `{Ax:euclidean_neutral_ruler_compass}.

Lemma lemma_TTflip2 :
forall A B C D E F G H,
TT A B C D E F G H ->
TT A B C D H G F E.