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Theorem hpal-reachset-set

finout(g), ∀ a. a ∈ s → ¬ haspathanylength(g)(a) ⊦ ∃ s0. ∀ b. (∃ a. a ∈ s ∧ path(g)(a, b)) ↔ b ∈ s0

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