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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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