| n < nused, nused ≤ # zbrar, zbrar[n].key = key, sorted(zbrar, 0, nused) ⊦ keys(zbrar[n, mkzentry(key, adr)], 0, nused) = keys(zbrar, 0, nused) ++ key |
zbrar[n].key = key, n < nused, sorted(zbrar, 0, nused), nused ≤ # zbrar ⊦ keys(zbrar[n, mkzentry(key, adr)], 0, nused) = keys(zbrar, 0, nused) ++ key