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Proof step 1 from proof rm-size-in-01 (conclusion)

⊦ # rmdup(x + y + z) = # rmdup(x + z) ∧ a ∈ y → a ∈ x ∨ a ∈ z

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
# rmdup(x + y + z) = # rmdup(x + z), a ∈ y ⊦ a ∈ x, a ∈ z

Rule argument

Additional information