Set.vsub_subset_vsub

∀ {α : Type u_2} {β : Type u_3} [inst : VSub α β] {s₁ s₂ t₁ t₂ : Set β}, s₁ ⊆ s₂ → t₁ ⊆ t₂ → s₁ -ᵥ t₁ ⊆ s₂ -ᵥ t₂

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