-lemma fsb_inv_csx: â\88\80h,g,G,L,T. â¦\83G, Lâ¦\84 â\8a¢ ⦥[h, g] T → ⦃G, L⦄ ⊢ ⬊*[h, g] T.
-#h #g #G #L #T #H elim H -G -L -T /5 width=1 by csx_intro_cpxs, fpbu_cpxs/
+lemma fsb_inv_csx: â\88\80h,g,G,L,T. ⦥[h, g] â¦\83G, L, Tâ¦\84 → ⦃G, L⦄ ⊢ ⬊*[h, g] T.
+#h #g #G #L #T #H elim H -G -L -T /5 width=1 by csx_intro, fpb_cpx/