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Proof step 9 from proof reachable-split-last (previous step)

x ≠ [], path(r ' + x, H), x.last ∈ H ⊦ r = x.last, ∃ r1. reachable(r, r1, H) ∧ H[r1].nxt = x.last ∧ H[r1].nxt ≠ null

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information