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Proof step 18 from proof prepost-read-superblock (previous step)

⊦ ⟪decode_superblock#(n, buf, EB_PAGE_SIZE; sb, n0; err)⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → is-encoded(sb, subarray(buf, n, encoding-size(sb, EB_PAGE_SIZE))) ∧ n + encoding-size(sb, EB_PAGE_SIZE) ≤ # buf ∧ n0 = encoding-size(sb, EB_PAGE_SIZE)))

A spec-lemma