Data:L11a520/HOMFLYPT Polynomial

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