Data:K12a137/HOMFLYPT Polynomial

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[math]\displaystyle{ -a^2 z^8+2 a^4 z^6-4 a^2 z^6+2 z^6-a^6 z^4+6 a^4 z^4-7 a^2 z^4-z^4 a^{-2} +5 z^4-2 a^6 z^2+5 a^4 z^2-6 a^2 z^2-z^2 a^{-2} +2 z^2+a^4-a^2+ a^{-2} }[/math]