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Proof step 1 from proof nodups (conclusion)

∀ a. a ∈ x ↔ a ∈ y, ¬ dups(x), ¬ dups(y) ⊦ perm(x, y)

System applied rule normalize

And obtained the following new goals

Proof step 2:
∀ a. a ∈ x ↔ a ∈ y ⊦ dups(x), dups(y), perm(x, y)

Rule argument

Additional information