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Proof step 7 from proof delapp (previous step)

⊦ x = [], (∀ a0. #oc(a0, x) + #oc(a0, y) ≤ #oc(a0, y -1l a)) ∧ (∀ a0. #oc(a0, y -1l a) ≤ #oc(a0, x) + #oc(a0, y)) ↔ x = [] ∧ ¬ a ∈ y

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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