Data:L9n17/Multivariable Alexander

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