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Proof step 2 from proof modnotreachable-reachable-rev-weak (previous step)

r0 ∈ H ⊦ reachable(r, r1, H[r0, ce]) ↔ false, r0 = null, reachable(r, r1, H), reachable(r, r0, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information