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\mathbf{U} = \begin{bmatrix}
\mathbf{U} = \begin{bmatrix}
\color {Green}0&\color {Blue}-1&\color {Cyan}0&\color {Emerald}0 \\
\color {Green}0&\color {Blue}-1&\color {Cyan}0&\color {Emerald}0 \\
color {Green}-1&\color {Blue}0&\color {Cyan}0&\color {Emerald}0 \\
\color {Green}-1&\color {Blue}0&\color {Cyan}0&\color {Emerald}0 \\
color {Green}0&\color {Blue}0&\color {Cyan}0&\color {Emerald}-1 \\
\color {Green}0&\color {Blue}0&\color {Cyan}0&\color {Emerald}-1 \\
color {Green}0&\color {Blue}0&\color {Cyan}-1&\color {Emerald}0
\color {Green}0&\color {Blue}0&\color {Cyan}-1&\color {Emerald}0
\end{bmatrix}
\end{bmatrix}
</math>
</math>