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Proof step 14 from proof diff-union (previous step)

¬ a ∈ y0, ∀ z. rmdup(y0) \ z = rmdup(y0 \ z) ⊦ (a ' + rmdup(y0)) \ z = rmdup((a ' + y0) \ z)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information