az5−z5a−1−a3z3 + 5az3−6z3a−1 + 2z3a−3−2a3z + 8az−12za−1 + 7za−3−za−5−a3z−1 + 6az−1−11a−1z−1 + 8a−3z−1−2a−5z−1 + az−3−3a−1z−3 + 3a−3z−3−a−5z−3