Data:K12a643/HOMFLYPT Polynomial

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[math]\displaystyle{ -z^4 a^6-3 z^2 a^6-2 a^6+z^6 a^4+3 z^4 a^4+3 z^2 a^4+2 a^4+2 z^6 a^2+7 z^4 a^2+6 z^2 a^2+a^2+z^6+3 z^4+2 z^2+1-z^4 a^{-2} -3 z^2 a^{-2} - a^{-2} }[/math]