−z4a10−4z2a10−3a10 + 2z6a8 + 10z4a8 + 14z2a8 + 6a8−z8a6−6z6a6−12z4a6−11z2a6−5a6 + z6a4 + 5z4a4 + 7z2a4 + 3a4