Data:K13n2520/HOMFLYPT Polynomial

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