Data:K12n878/HOMFLYPT Polynomial

Failed to parse (syntax error): {\displaystyle z^6}{a^2}- $Failed^{-1} -3 z^4}{a^4}- $Failed^{-1} -2 z^4+a^2 z^2-2 z^2}{a^2}- $Failed^{-1} -2 z^2}{a^4}+ $Failed^{-1} +2 z^2}{a^6}- $Failed^{-1} -2}{a^2}+ $Failed^{-1} +1}{a^4}+ $Failed^{-1} +2}