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Theorem nonnullrefs-dups-firstoc

⊦ dups(vals .nonnullrefs) ↔ (∃ r, vals0, vals1, vals2. vals = vals0 + (refval(r) + (vals1 + (refval(r) + vals2))) ∧ r ≠ jvmref ∧ ¬ refval(r) ∈ vals0 ∧ ¬ refval(r) ∈ vals1)

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