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Proof step 7 from proof perm-del-01 (previous step)

a0 ≠ a, perm(x -l a, z), perm(x, y), perm(z, x -l a), perm(y, x), a0 ∈ y -l a ∨ a0 ∈ z ⊦ #oc(a0, y) = #oc(a0, z)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information