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Proof step 2 from proof rmdup-last (previous step)

⊦ rmdup(x + a ') = rmdup(x) + a ', a ∈ x

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ rmdup(x + a ') = rmdup(x) + a ', a ∈ x

Rule argument

Additional information