Data:L9n21/HOMFLYPT Polynomial
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[math]\displaystyle{ -z^2 a^4-a^4 z^{-2} -2 a^4+z^4 a^2+5 z^2 a^2+4 a^2 z^{-2} +8 a^2-z^4-6 z^2-5 z^{-2} -9+z^2 a^{-2} +2 a^{-2} z^{-2} +3 a^{-2} }[/math]
