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Proof step 41 from proof prepost-io-write-data (
previous step
)
⊦ valid-peb(mkpeb(aehdr, avhdr, buf, m, false)) ∧ m ≤ m0 ∧ m0 + # buf0 = LEB_SIZE ∧ ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf, m, false)) → valid-peb(mkpeb(aehdr, avhdr, subarray(buf, 0, m0) + buf0, m0 + m1, false))
A spec-lemma