Data:L9a55/Multivariable Alexander

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[math]\displaystyle{ -\frac{2 t(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)-2 t(3) t(4) t(1)+2 t(4) t(1)-2 t(1)-2 t(2)+2 t(2) t(3)-t(3)+t(2) t(4)-2 t(2) t(3) t(4)+2 t(3) t(4)-t(4)+1}{\sqrt{t(1)} \sqrt{t(2)} \sqrt{t(3)} \sqrt{t(4)}} }[/math]