⊦ n ≤ # bits → fillsgn(n, bits) = bits
Used simplifier rules: ⊦ m < n → ¬ n < m;% ⊦ ¬ m ≤ n ↔ n < m;% ⊦ m < n → m ≤ n;% ⊦ ¬ n < n; Used terms: bits, n