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Proof step 1 from proof ocs-del-del1 (conclusion)

⊦ #oc(a, x) = 1 → x -l a = x -1l a

System applied rule normalize

And obtained the following new goals

Proof step 2:
#oc(a, x) = 1 ⊦ x -l a = x -1l a

Rule argument

Additional information