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Theorem reachable-addnew-rev

⊦ ¬ r2 ∈ H ∧ r ∈ H ∧ ¬ reachable(r, r1, H) → (reachable(r, r1, H[r2, ce]) ↔ (∃ r0. reachable(r, r0, H) ∧ H[r0].nxt = r2 ∧ r2 ≠ null ∧ (r1 = r2 ∨ reachable(ce.nxt, r1, H))))

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