User:Pubbawup

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\begin{bmatrix} 0 & {1 \over 2} & 0 & {1 \over 2} \\ {1 \over 2} & 0 & {1 \over 2} & 0 \\ 0 & {1 \over 2} & 0 & {1 \over 2} \\ {1 \over 2} & 0 & {1 \over 2} & 0\end{bmatrix}

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