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Proof step 1 from proof Data-in-putdelput (conclusion)

⊦ ¬ d0 ∈ st ∧ d0 ≠ d1 ∧ d0 ≠ d2 → ¬ d0 ∈ (st[b, d1] -- a)[c, d2]

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information