Data:L9a49/HOMFLYPT Polynomial

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-z^2 a^{-4} +a^4+z^4 a^{-2} -2 a^2 z^2+a^2 z^{-2} +z^2 a^{-2} + a^{-2} z^{-2} +2 a^{-2} +z^4-z^2-2 z^{-2} -3