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Proof step 12 from proof binheap-inv-remove-wbufs (
previous step
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⊦ valid-idx(kar, lpt, n) ↔ n ≤ # kar ∧ (∀ m. m < n → kar[m].idx < # lpt ∧ lpt[kar[m].idx].gcheapidx = m)
A spec-lemma