Data:L8a21/Multivariable Alexander

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