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Proof step 20 from proof k-reachable-def (previous step)

reachable-n(H, n, H[r].nxt, x0.last), path(H[r].nxt ' + x0, H), r ∈ H ⊦ x0 = [], r = null, ∃ n. reachable-n(H, n, r, x0.last)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information