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Proof step 41 from proof prepost-read-superblock (previous step)

# buf3 + # buf2 = encoding-size(sb0, EB_PAGE_SIZE), LEB_SIZE = n0 + encoding-size(sb0, EB_PAGE_SIZE), avol[0] = mapped(buf3 + buf2), subarray(buf3, 0, encoding-size(sb, EB_PAGE_SIZE)) = buf0 + buf, encoding-size(sb, EB_PAGE_SIZE) < # buf3, encoding-size(sb, EB_PAGE_SIZE) < LEB_SIZE, encoding-size(sb, EB_PAGE_SIZE) < encoding-size(sb0, EB_PAGE_SIZE), ebm-vol-inv(avol), is-encoded-unaligned(sb, buf0), is-encoded-unaligned(sb0, buf3), encoding-size(sb0, EB_PAGE_SIZE) ≤ LEB_SIZE, # buf0 ≤ # buf3 → ¬ is-encoded-unaligned(sb, subarray(buf3, 0, # buf0)) ⊦ # avol = 0, sb = sb0

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: left 12

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