Data:10 39/HOMFLYPT Polynomial

$z^4 a^8+2 z^2 a^8-z^6 a^6-3 z^4 a^6-2 z^2 a^6-z^6 a^4-3 z^4 a^4-2 z^2 a^4-a^4+z^4 a^2+3 z^2 a^2+2 a^2$