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Proof step 292 from proof prepost-atomic-leb-change (
previous step
)
ubi-io-inv(apebs), ubi-io-write-vidhdr-pre(n, avhdr, apebs) ⊦ ⟪aubi_io_write_vidhdr#(n, avhdr; apebs; err)⟫ ubi-io-inv(apebs)
A spec-lemma