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Proof step 5 from proof get-butlast (previous step)

n ≤ # x0, ∀ n, a. n < # x0 → (x0 + a ')[n] = x0[n] ∨ x0 = [] ⊦ x0 = [], ((a0 ' + x0) + a ')[n] = (a0 ' + x0)[n]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information