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Proof step 4 from proof fromnext-reachable-rev (previous step)

∃ x. path(H[r].nxt ' + x, H) ∧ (H[r].nxt ' + x).last = r0, r ∈ H, r0 ∈ H ⊦ r = null, r = r0, reachable(r, r0, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information