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Theorem acyclic-rem-not-reachable

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

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