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Proof step 13 from proof ocs-same-length-all (previous step)

x0 = mklist(a, # x0), b ∈ x0, ∀ a. x0 = mklist(a, # x0) ↔ (∀ b. b ∈ x0 → b = a), ∀ b. b ∈ x0 → b = a ⊦ b = a

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 4 terms: b

Additional information

Used terms: b