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

r0 ∈ H, ∃ x. path(r ' + x, H[r0, ce]) ∧ (r ' + x).last = r1, r1 ∈ H[r0, ce] ⊦ reachable(r, r1, H), reachable(r, r0, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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