Set.prod_add_prod_comm

∀ {α : Type u_2} {β : Type u_3} [inst : Add α] [inst_1 : Add β] (s₁ s₂ : Set α) (t₁ t₂ : Set β),
  s₁ ×ˢ t₁ + s₂ ×ˢ t₂ = (s₁ + s₂) ×ˢ (t₁ + t₂)

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