Data:K12n828/HOMFLYPT Polynomial

Failed to parse (syntax error): {\displaystyle -z^6}{a^2}- $Failed^{-1} -2 z^6+2 a^2 z^4-2 z^4}{a^2}+ $Failed^{-1} +z^4}{a^4}- $Failed^{-1} -7 z^4+4 a^2 z^2-z^2}{a^2}+ $Failed^{-1} +2 z^2}{a^4}- $Failed^{-1} -8 z^2+2 a^2+1}{a^4}- $Failed^{-1} -2}