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Proof step 1 from proof prefix-trans (conclusion)

⊦ σ ⊑ σ0 ∧ σ0 ⊑ σ1 → σ ⊑ σ1

System applied rule normalize

And obtained the following new goals

Proof step 2:
σ ⊑ σ0, σ0 ⊑ σ1 ⊦ σ ⊑ σ1

Rule argument

Additional information