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Proof step 1 from proof Data-notin-other-2 (conclusion)

⊦ d0 ≠ d1 ∧ d0 ≠ d2 ∧ ¬ d0 ∈ st → ¬ d0 ∈ st[a, d1][b, d2]

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information