table of contents lytex

\documentclass{article}
\usepackage[utf8]{inputenc}
 
\title{Sections and Chapters}
\author{Gubert Farnsworth}
\date{ }
  
\begin{document}
  
\maketitle
  
\tableofcontents

\section{Introduction}
   
This is the first section.
      
Lorem  ipsum  dolor  sit  amet,  consectetuer  adipiscing  
elit.   Etiam  lobortisfacilisis sem.  Nullam nec mi et 
neque pharetra sollicitudin.  Praesent imperdietmi nec ante. 
Donec ullamcorper, felis non sodales...
       
\addcontentsline{toc}{section}{Unnumbered Section}
\section*{Unnumbered Section}

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Etiam lobortis facilisissem.  Nullam nec mi et neque pharetra 
sollicitudin.  Praesent imperdiet mi necante...

\section{Second Section}
       
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Etiam lobortis facilisissem.  Nullam nec mi et neque pharetra 
sollicitudin.  Praesent imperdiet mi necante...
         
\end{document}