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Proof step 8 from proof removed-stays-reachable (
previous step
)
⊦ reachable(r, r1, H) → (¬ reachable(r, H[r1].nxt, H) ↔ H[r1].nxt = null ∨ ¬ H[r1].nxt ∈ H)
Lemma
reach-reachnext