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Proof step 7 from proof perm-put-del1 (previous step)

¬ a0 ≠ y[n], n < # y, a0 ∈ y[n, a] -1l a ∨ a0 ∈ y -1l y[n] ⊦ y = [], #oc(a0, y[n, a] -1l a) = #oc(a0, y -1l y[n])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information