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$\left| \begin{matrix} x-y & y & x \\ (x-y)(x+y) & { y }^{ 2 } & { x }^{ 2 }+xy \\ (x-y)({ x }^{ 2 }+xy+{ y }^{ 2 }) & { y }^{ 3 } & { x }^{ 3 }+{ x }^{ 2 }y+x{ y }^{ 2 } \end{matrix} \right| = \text{?}$

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