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Proof step 1 from proof disjoint-move-left (conclusion)

⊦ st0 ⊥ st1 → st0[a, d] ⊥ st1 -- a

System applied rule normalize

And obtained the following new goals

Proof step 2:
st0 ⊥ st1 ⊦ st0[a, d] ⊥ st1 -- a

Rule argument

Additional information