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Proof step 26 from proof prepost-encode-padding (previous step)

# buf = 2 * NODE_HEADER_SIZE + n0, # buf1 = # buf, subarray(buf1, NODE_HEADER_SIZE, NODE_HEADER_SIZE + n0) = subarray(buf, NODE_HEADER_SIZE, NODE_HEADER_SIZE + n0), n < # buf, is-aligned(n0, 2 * NODE_HEADER_SIZE), is-encoded(nodeheader(n0, true), subarray(buf1, 0, NODE_HEADER_SIZE)) ⊦ (n < NODE_HEADER_SIZE + n0 ⊃ buf1[n];(validtrailer)[n - NODE_HEADER_SIZE + n0]) = (n < NODE_HEADER_SIZE ⊃ buf1[n];(subarray(buf1, NODE_HEADER_SIZE, n0) + validtrailer)[n - NODE_HEADER_SIZE]), buf = mkbuf(0)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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