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Proof step 1 from proof prefix-rem-left (conclusion)

⊦ st0 \ ns ⊑ st \ ns → (st0 \ ns) -- n ⊑ st \ ns

System applied rule normalize

And obtained the following new goals

Proof step 2:
st0 \ ns ⊑ st \ ns ⊦ (st0 \ ns) -- n ⊑ st \ ns

Rule argument

Additional information