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Proof step 3 from proof fill-rec-false (previous step)

n = n0 + # bits, # bits ≤ n ⊦ bits = [], fillsgn(n + 1, bits) = false ' + mklist(false, n0) + bits, bits.first

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ bits = [], fillsgn((n0 + # bits) + 1, bits) = false ' + mklist(false, n0) + bits, bits.first

Rule argument

Additional information

Used simplifier rules: ⊦ m + n = n + m;% ⊦ (m + n0) + n1 = m + n0 + n1;% ⊦ m ≤ m + n;