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Sorry, the file main.tex should read as <BR>
<DIV> </DIV>
<DIV>% main.tex =============================</DIV>
<DIV>\documentclass{book}<BR>\includeonly{ex1}<BR>\begin{document}<BR>\include{ex1}<BR>\end{document} </DIV>
<DIV>%%======================================== </DIV>
<DIV>%%end of main.tex </DIV>
<DIV> </DIV>
<DIV>And the file ex1.tex is</DIV>
<DIV> </DIV>
<DIV>%% ex1.tex ===========================</DIV>
<DIV>\XeTeXinputencoding 'utf-8'</DIV>
<DIV> </DIV>
<DIV>What is wrong? </DIV>
<DIV>%%=====================================</DIV>
<DIV>%% end of ex1.tex</DIV>
<DIV> </DIV>
<DIV>After running </DIV>
<DIV> xelatex main</DIV>
<DIV>I got</DIV>
<DIV> 'No pages out'</DIV>
<DIV> </DIV>
<DIV>What is wrong with it?</DIV>
<DIV> </DIV>
<DIV>Best </DIV>
<DIV>Xiao</DIV><BR>
<HR>
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