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Theorem rem-reachable-rev

⊦ ce.nxt = (h((h(r1)).nxt)).nxt ∧ r0 ≠ (h(r1)).nxt ∧ (h(r1)).nxt ∈ h ∧ (h(r1)).nxt ≠ null ∧ r1 ≠ null ∧ r1 ∈ h → (reachable(r, r0, h(r1 := ce)) ↔ reachable(r, r0, h))

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