Data:K12a9/HOMFLYPT Polynomial

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