∀ {G : Type u_1} {H : Type u_2} [inst : Group G] [inst_1 : Group H] {I : Subgroup (G × H)}
  (hI₁ : Function.Surjective (Prod.fst ∘ ⇑I.subtype)) (hI₂ : Function.Surjective (Prod.snd ∘ ⇑I.subtype)),
  have this := ⋯;
  have this_1 := ⋯;
  ∃ e,
    (((QuotientGroup.mk' I.goursatFst).prodMap (QuotientGroup.mk' I.goursatSnd)).comp I.subtype).range =
      e.toMonoidHom.graph