∀ {α : Type u_1} [inst : Group α] {s t : Subgroup α} (h_le : s ≤ t) (a : (α ⧸ t) × ↥t ⧸ s.subgroupOf t),
  (Subgroup.quotientEquivProdOfLE h_le).symm a = Quotient.map' (fun b => Quotient.out a.1 * ↑b) ⋯ a.2