(* STAR-ITERATED SUPCLOSURE *************************************************)
(* Properties with generic slicing for local environments *******************)
-(*
+
lemma fqus_drops: ∀G,L,K,T,U,l. ⬇*[l] L ≡ K → ⬆*[l] T ≡ U →
⦃G, L, U⦄ ⊐* ⦃G, K, T⦄.
#G #L #K #T #U * /3 width=3 by fqup_drops_succ, fqup_fqus/
#HLK #HTU <(lifts_fwd_isid … HTU) -U // <(drops_fwd_isid … HLK) -K //
qed.
-*)
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