Data:K12n816/HOMFLYPT Polynomial

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-z^2 a^6-a^6+3 z^4 a^4+6 z^2 a^4+3 a^4-2 z^6 a^2-7 z^4 a^2-9 z^2 a^2-3 a^2+3 z^4+5 z^2+2-z^2 a^{-2}