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Proof step 19 from proof rmdup-last (previous step)

∀ a. rmdup(x0 + a ') = rmdup(x0 -l a) + a ' ⊦ a0 ∈ x0, a = a0, (a0 ∈ x0 ⊃ rmdup(x0 + a ');a0 ' + rmdup(x0 + a ')) = rmdup(a0 ' + (x0 -l a)) + a '

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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