Data:10 28/HOMFLYPT Polynomial

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