fact: Axiom binds_remove_mid : binds x a (F ++ (y ~ b) ++ G) -> x <> y -> binds x a (F ++ G).
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.AssocList Metalib.MetatheoryAtom Metalib.LibTactics