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Proof step 23 from proof nodups-butlastn (previous step)

x ≠ [], a ∈ butlastn(# x, a0 ' + x.butlast), ∀ a, n. a ∈ butlastn(n, x) ∧ n ≤ # x → a ∈ x ⊦ a = a0, a ∈ x

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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