Data:L9a55/Multivariable Alexander

$-{\frac {2t(2)t(1)-t(2)t(3)t(1)+t(3)t(1)-t(2)t(4)t(1)+t(2)t(3)t(4)t(1)-2t(3)t(4)t(1)+2t(4)t(1)-2t(1)-2t(2)+2t(2)t(3)-t(3)+t(2)t(4)-2t(2)t(3)t(4)+2t(3)t(4)-t(4)+1}{{\sqrt {t(1)}}{\sqrt {t(2)}}{\sqrt {t(3)}}{\sqrt {t(4)}}}}$