Data:L11n335/HOMFLYPT Polynomial

$a^8 z^{-2} +2 z^2 a^6-2 a^6 z^{-2} -a^6-3 z^4 a^4-4 z^2 a^4+a^4 z^{-2} +z^6 a^2+2 z^4 a^2+2 z^2 a^2-z^4+1$