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Proof step 15 from proof f-rm (previous step)

a ∈ x0, a ∈ y, ∀ y. filter(rmdup(x0), y) = rmdup(filter(x0, y)) ⊦ filter(rmdup(x0), y) = rmdup(filter(x0, y))

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: y

Additional information

Used terms: y