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Proof step 1 from proof last-elim (conclusion)

x ≠ [] ⊦ a = x.last ∧ y = x.butlast ↔ x = y + a '

System applied rule normalize

And obtained the following new goals

Proof step 2:
⊦ a = x.last ∧ y = x.butlast ↔ x = y + a ', x = []

Rule argument

Additional information