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1 & -1 & 1 & 1 \\[6pt] -1 & -1 & 1 & -1\\[6pt] \end{array}
\right].</math>
== References ==
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1 & -1 & 1 & 1 \\[6pt] -1 & -1 & 1 & -1\\[6pt] \end{array}
\right].</math>
== References ==
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