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Proof step 1 from proof in-vl-subset (conclusion)

⊦ q1 ⊆ q0 ∧ lref ∈ q1 → lref ∈ q0

System applied rule normalize

And obtained the following new goals

Proof step 2:
lref ∈ q1, q1 ⊆ q0 ⊦ lref ∈ q0

Rule argument

Additional information