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Proof step 175 from proof hasSharing-addobj-same (
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⊦ ¬ dups(fis .keys) → (r ∈ fis .vals .nonnullrefs ↔ r ≠ jvmref ∧ (∃ sk. fis[sk] = refval(r) ∧ sk ∈ fis))
A spec-lemma