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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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