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Proof step 2 from proof lslen-fromnotempty (previous step)

⌜n⌝ < # σ ⊦ σ from n = [] ↔ false

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
σ from n = [], ⌜n⌝ < # σ ⊦

Rule argument

Additional information