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Proof step 2 from proof add-preserves-reachable (previous step)

H[r1].nxt = H[r2].nxt, ce.nxt = r2, reachable(r, r0, H), reachable(r, r1, H), r2 ∈ H ⊦ r2 = null, reachable(r, r0, H[r1, ce]), reachable(r, r2, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information