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Proof step 28 from proof ushort-band-shift (previous step)

65536 + j * 256 = 256 * (256 + j), s2i(sho) = j * 256, j < 0, ~256 ≤ j, 0 ≤ (65536 + j * 256) / 256 ⊦ 255 + (1 + j) % 256 = ((65536 + j * 256) / 256) % 256

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 1 flags: discard

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