这是本文档旧的修订版！
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简单居中方框
This is example text . And after that the text just continues to flow in the same paragraph.
\(1+2+\dots+n=\frac{n(n+1)}{2}\)
$a^2 + b^2 = c^2$
\(\gua64{泽天夬}\)
<html> sdf </html>
Titel
asdfa
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