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Proof step 20 from proof crash-neutral-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), apebs0 = apebs, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟨abort⟩ (apebs0 = apebs), ubi-io-write-echdr-pre(n, aehdr, apebs)

Heuristic symbolic execution applied rule abort right

And obtained the following new goals

Rule argument

Additional information