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Proof step 46 from proof prepost-write-once (
previous step
)
ubi-io-inv(apebs), ubi-io-write-data-pre(n, n0, n1, n2, buf, apebs) ⊦ ⟪aubi_io_write_data#(n, n0, n1, n2, buf; apebs; err)⟫ ubi-io-inv(apebs)
A spec-lemma