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$000$

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$\stackrel{}{}{\stackrel{}{}}_0{\stackrel{}{}}_{}$

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0

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$\begin{array}{c}\stackrel{}{}{\stackrel{}{}}_{0}0\\ \stackrel{}{}{\stackrel{}{}}_0\end{array}$

$0$

${}_{}{}_{}{}_{}{}_{}0$

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$000$

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${}_{}0{}_{}$

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