az5−2z5a−1−a3z3 + 7az3−11z3a−1 + 3z3a−3−3a3z + 15az−22za−1 + 11za−3−za−5−3a3z−1 + 14az−1−22a−1z−1 + 14a−3z−1−3a−5z−1−a3z−3 + 5az−3−9a−1z−3 + 7a−3z−3−2a−5z−3