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Proof step 1 from proof rm-vl-in-before (conclusion)

⊦ lref ∈ q → (lref ∈ q - lref0 ↔ lref ≠ lref0)

System applied rule normalize

And obtained the following new goals

Proof step 2:
lref ∈ q ⊦ lref ∈ q - lref0 ↔ lref ≠ lref0

Rule argument

Additional information