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Proof step 1 from proof crash-neutral-isbad (conclusion)

ubi-io-isbad-pre(n, apebs), ubi-io-inv(apebs), apebs0 = apebs ⊦ ⟨aubi_io_isbad#(n, apebs; ; isbad, err)⟩ (apebs0 = apebs)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information