这是本文档旧的修订版!
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简单居中方框
This is example text with some of it only shown when you unfold it. And after that the text just continues to flow in the same paragraph.
\(1+2+\dots+n=\frac{n(n+1)}{2}\)
$a^2 + b^2 = c^2$
\(\gua64{泽天夬}\)