Data:10 73/HOMFLYPT Polynomial

$-a^8+3 z^2 a^6+3 a^6-3 z^4 a^4-6 z^2 a^4-4 a^4+z^6 a^2+3 z^4 a^2+5 z^2 a^2+3 a^2-z^4-z^2$