Data:L11n426/HOMFLYPT Polynomial

$a^4 z^2+a^4 z^{-2} +2 a^4-a^2 z^4-5 a^2 z^2-2 a^2 z^{-2} -z^2 a^{-2} -7 a^2-2 a^{-2} +z^4+5 z^2+ z^{-2} +7$