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Theorem add-preserves-reachable

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

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