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Proof step 1 from proof oc-del-02 (conclusion)

⊦ #oc(a0, x) ≤ #oc(a0, y) → ¬ #oc(a0, y -1l a) < #oc(a0, x -1l a)

System applied rule normalize

And obtained the following new goals

Proof step 2:
#oc(a0, y -1l a) < #oc(a0, x -1l a), #oc(a0, x) ≤ #oc(a0, y) ⊦

Rule argument

Additional information