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Proof step 5 from proof perm-all (previous step)

(∀ a. #oc(a, x) ≤ #oc(a, y)) ∧ (∀ a. #oc(a, y) ≤ #oc(a, x)) ⊦ ∀ a. a ∈ x ∨ a ∈ y → #oc(a, x) = #oc(a, y)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information