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Proof step 32 from proof unmodified-payload (previous step)

BRANCH_SIZE = # zbrar, iast[adr] = indexnode(brar, bv1, nused), indexnode(brar, bv1, nused) = save(mkznode(rp, zbrar, bv1, false, nused)), sorted(zbrar, 0, nused), adr ∈ iast, nused ≤ BRANCH_SIZE ⊦ (∃ n. n < nused ∧ load(brar[n]).entry? ∧ load(brar[n]).key = key) ↔ (∃ n. n < nused ∧ zbrar[n].entry? ∧ zbrar[n].key = key)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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