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Proof step 589 from proof bitsand-cast (previous step)

n = m + 1, m = 0, # bits1 = 2 + # bits ⊦ n = 0, bits3 + bits1 = [], bits3 = [], lastn(n + 1 + # bits, fillsgn(n + 1 + # bits, bitsand(bits1, false ' + true ' + bits))) = lastn(n + 1 + # bits, fillsgn(n + 1 + # bits, bitsand(false ' + true ' + bits, bits3 + bits1)))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information