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Theorem nonnullrefs-dups

⊦ dups(vals .nonnullrefs) ↔ (∃ r, m, n. vals[m] = refval(r) ∧ vals[n] = refval(r) ∧ r ≠ jvmref ∧ m ≠ n ∧ m < # vals ∧ n < # vals)

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