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thank you very much for the response That fixed my problem

Hello all, I am new to latex. In my main file I am using the code:
\documentclass{book}

\includeonly{part_1,part_2,part_3,part_4}

\begin{document}
\title{myTitle}
\author{myName}
\include{part_1}
\include{part_2}
\include{part_3}
\include{part_4}
\end{document}
part_1.tex, part_2.tex, part_3 ...