Data:L7a7/HOMFLYPT Polynomial
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[math]\displaystyle{ a^4 z^{-2} +a^4-2 z^2 a^2-2 a^2 z^{-2} -3 a^2+z^4+2 z^2+ z^{-2} +2-z^2 a^{-2} }[/math]
[math]\displaystyle{ a^4 z^{-2} +a^4-2 z^2 a^2-2 a^2 z^{-2} -3 a^2+z^4+2 z^2+ z^{-2} +2-z^2 a^{-2} }[/math]