Data:K12n285/HOMFLYPT Polynomial

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[math]\displaystyle{ z^6 a^{-4} -2 z^4 a^{-2} +4 z^4 a^{-4} -z^4 a^{-6} -5 z^2 a^{-2} +5 z^2 a^{-4} -3 z^2 a^{-6} +z^2-2 a^{-2} +2 a^{-4} -2 a^{-6} + a^{-8} +2 }[/math]