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Proof step 2 from proof rm-size (previous step)

⊦ # rmdup(x + a ' + y) = # rmdup(x + y) + 1, a ∈ y, a ∈ x

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ # rmdup(x + a ' + y) = # rmdup(x + y) + 1, a ∈ x, a ∈ y

Rule argument

Additional information