测试
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@ -22,3 +22,7 @@ $\begin{cases}
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2+1=2 \\\\
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2+1=2 \\\\
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2+2=4
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2+2=4
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\end{cases}$
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\end{cases}$
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$\begin{equation}
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E = mc^2
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\end{equation}$
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