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Proof step 1 from proof fillsgn-length (conclusion)

⊦ bytes ≠ [] → n ≤ # fillsgn(n, bytes)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
# fillsgn(n, bytes) < n ⊦ bytes = []

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0;% ⊦ m < n → n ≠ 0; (forward)% ⊦ ¬ m ≤ n ↔ n < m;