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Theorem frommodified

⊦ r ≠ null ∧ ce.nxt ≠ r → (reachable(r, r0, h[r := ce]) ↔ r = r0 ∨ ce.nxt ≠ null ∧ ce.nxt ∈ h ∧ reachable(ce.nxt, r0, h[r := ce]))

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