−a10−za9 + a9z−1−z4a8 + 4z2a8−3a8−z5a7 + 5z3a7−7za7 + 3a7z−1−z4a6 + 4z2a6−3a6−z5a5 + 5z3a5−6za5 + 2a5z−1