∀ {α : Type u} {m : Std.HashSet.Raw α} [inst : BEq α] [inst_1 : Hashable α] [EquivBEq α] [LawfulHashable α],
  m.WF →
    ∀ {l : List α} {k k' : α},
      (k == k') = true →
        k ∉ m → List.Pairwise (fun a b => (a == b) = false) l → k ∈ l → (m.insertMany l).get? k' = some k