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Theorem k-path

⊦ path(x, h) ↔ # x = 1 ∧ x.head ∈ h ∧ x.head ≠ null ∨ # x = 1 + 1 ∧ x.head ∈ h ∧ x.tail.head ∈ h ∧ x.head ≠ null ∧ x.tail.head ≠ null ∧ h[x.head].nxt = x.tail.head ∨ # x ≥ 1 + 1 ∧ x.head ∈ h ∧ x.head ≠ null ∧ h[x.head].nxt = x.tail.head ∧ path(x.tail, h)

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