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Proof step 1 from proof lin (conclusion)

⊦ true → ¬ x.last ∈ x.rest → x = [] ∨ x.rest = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ x = [], x.rest = [], x.last ∈ x.rest

Rule argument

Additional information