Data:L8a20/HOMFLYPT Polynomial

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