+(* Advanced properties ******************************************************)
+
+lemma tdeq_fpbs_trans: ∀h,o,T1,T. T1 ≛[h, o] T →
+ ∀G1,G2,L1,L2,T2. ⦃G1, L1, T⦄ ≥[h, o] ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ ≥[h, o] ⦃G2, L2, T2⦄.
+/3 width=5 by ffdeq_fpbs_trans, tdeq_ffdeq/ qed-.
+