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Proof step 2 from proof reachable-addnewtonull-rev (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
ce.nxt = null, reachable(r, r1, H[r2, ce]), r1 ∈ H ⊦ reachable(r, r1, H), r2 ∈ H

Rule argument

Additional information