Data:K12n685/HOMFLYPT Polynomial

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