| ⊦ iast[adr] = indexnode(brar, bv0, m) ∧ n < nused ∧ nused ≤ BRANCH_SIZE ∧ unmodified(adr, mkznode(rp, zbrar, bv1, false, nused), iast) → load(brar[n]).key = zbrar[n].key |
iast[adr] = indexnode(brar, bv0, m), n < nused, unmodified(adr, mkznode(rp, zbrar, bv1, false, nused), iast), nused ≤ BRANCH_SIZE ⊦ load(brar[n]).key = zbrar[n].key