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Proof step 26 from proof sis-neg-high (previous step)

65536 * i0 - 32768 = (2 * i0 - 1) * 2 ^ 15, i0 < 0 ⊦ i0 = 0, s2i(i2s(bits2int(lastn(16, int2bits(65536 * i0 - 32768))))) = ~32768

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 1 flags: discard

Additional information