Data:K12a309/HOMFLYPT Polynomial

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