Data:K13a1097/HOMFLYPT Polynomial

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[math]\displaystyle{ -a^4 z^8-a^2 z^8+a^6 z^6-4 a^4 z^6-2 a^2 z^6+2 z^6+3 a^6 z^4-8 a^4 z^4+2 a^2 z^4-z^4 a^{-2} +5 z^4+3 a^6 z^2-9 a^4 z^2+7 a^2 z^2-2 z^2 a^{-2} +3 z^2+a^6-4 a^4+4 a^2- a^{-2} +1 }[/math]