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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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