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Proof step 1 from proof dups-lesize (conclusion)

¬ dups(x), ¬ dups(y), ∀ a. a ∈ x → a ∈ y ⊦ # x ≤ # y

System applied rule normalize

And obtained the following new goals

Proof step 2:
∀ a. a ∈ x → a ∈ y ⊦ dups(x), dups(y), # x ≤ # y

Rule argument

Additional information