Data:K12a640/HOMFLYPT Polynomial

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[math]\displaystyle{ -z^6 a^{-2} -z^6 a^{-4} -z^6+a^2 z^4-z^4 a^{-2} -2 z^4 a^{-4} +z^4 a^{-6} -3 z^4+2 a^2 z^2+2 z^2 a^{-2} +z^2 a^{-6} -4 z^2+a^2+2 a^{-2} + a^{-4} - a^{-6} -2 }[/math]