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Proof step 112 from proof truncate-empty (
previous step
)
⊦ ¬ # σ1 < ⌜n⌝ ∧ ¬ # σ2 < ⌜n1⌝ → (σ1 to n) + σ2 from n1 + n = σ2 from n1
A spec-lemma