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Proof step 8 from proof sgn-length-02 (previous step)

bits ≠ [] ∧ (bits.first ↔ boolvar), 2 + # bits ≤ # sgn(bits) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 9:
2 + # bits ≤ # sgn(bits) ⊦ bits = []

Rule argument

Additional information