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Proof step 2 from proof l-03 (previous step)

⊦ dups(x + b ') ↔ dups(x), b ∈ x

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: f: ⊦ dups(x + a ') ↔ a ∈ x ∨ dups(x);%a: ⊦ (x + y) + z = x + y + z; from specification list