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Theorem reachable-split-first

⊦ r ≠ r0 → (reachable(r, r0, H) ↔ r ≠ null ∧ r ∈ H ∧ (∃ r1. H[r].nxt = r1 ∧ r1 ∈ H ∧ r1 ≠ null ∧ reachable(r1, r0, H)))

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