End T11_1.
Section T11_2.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l11_31_2 : forall A B C D E F,
A <> B -> C <> B -> D <> E -> F <> E ->
Bet D E F ->
LeA A B C D E F.