Section Suma_2.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
(** ABC <= ABC + DEF. *)
(** DEF <= ABC + DEF. *)
(** LeA preserves SAMS. *)

Lemma sams_lea123_suma2__lea : forall A B C D E F G H I A' B' C' G' H' I',
LeA A B C A' B' C' -> SAMS A' B' C' D E F -> SumA A B C D E F G H I ->
SumA A' B' C' D E F G' H' I' -> LeA G H I G' H' I'.