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Proof step 8 from proof nonnullrefs-dups-firstoc (
previous step
)
⊦ r ∈ vals .nonnullrefs ↔ r ≠ jvmref ∧ (∃ vals0, vals1. vals = vals0 + (refval(r) + vals1) ∧ ¬ refval(r) ∈ vals0)
Lemma
nonnullrefs-in-firstoc