\documentclass[12pt]{article}
\usepackage{amsmath}

\textwidth=6.5in
\textheight=9.75in
\topmargin=-.75in
\headheight=0in
\headsep=.1in
\hoffset  -.75in

\def\dst{\displaystyle}
\def\LA{\LaTeX}
 \def\ra{\rightarrow}
\def\i{\infty}

\pagestyle{empty}

\begin{document}

\centerline {\large Lesson 6: Putting One Thing Over Another
Again}
\vskip.25in

In this lesson we will revisit methods for putting things on top
of other things in   \LA\: 

 
\begin{enumerate}
\item[]   
\verb"$$\overbrace{a+b+c+\cdots +z}$$"  
\hspace{.25in}  \parbox{2.5in}{$$ \overbrace{a+b+c+\cdots +z}$$}
 
\item[]  \verb"$$\overbrace{a+b+c+\cdots +z}^{n}$$"  
\hspace{.25in}  \parbox{2.5in}{$$\overbrace{a+b+c+\cdots +z}^{n}$$}
 

\item[]  \verb"$$\underbrace{a+b+c+\cdots +z}_{26\ \mathrm{symbols}}$$"  
\hspace{.25in}  \parbox{1.5in}{$$\underbrace{a+b+c+\cdots +z}_{26
\mathrm{symbols}}$$}

\item[]  \verb"$$\underleftarrow{a+b+c+\cdots +z} $$"  
\hspace{.25in}  \parbox{1.5in}{$$\underleftarrow{a+b+c+\cdots +z} $$}

\item[]  \verb"$$\overrightarrow{a+b+c+\cdots +z} $$"  
\hspace{.25in}  \parbox{1.5in}{$$\overrightarrow{a+b+c+\cdots +z}  $$}
\item[]  \verb"$$\overline{A\cup \overline{B}} $$"  
\hspace{.25in}  \parbox{1.5in}{$$ \overline{A\cup \overline{B}} 
$$} 

\item[] \begin{verbatim}
$$\underbrace{
  \overbrace{a+ \cdots + a}^{(m-n)/2}
   + \underbrace{b + \cdots + b}_{n}
   + \overbrace{a + \cdots + a}^{(m-n)/2}  
  }_{m}
$$
\end{verbatim}
produces

\parbox{6in}{
$$\underbrace{
  \overbrace{a+ \cdots + a}^{(m-n)/2}
   + \underbrace{b + \cdots + b}_{n}
   + \overbrace{a + \cdots + a}^{(m-n)/2}  
  }_{m}
$$ 
}


\end{enumerate}
 
\vskip.25in

 
 
 
\vskip.25in
\noindent \textbf{PROBLEM:}   
 
Give a one line \LA syntax for 
\hspace*{.25in} $ \dst  \overline{(\overline{z}+\overline{w})}=z+w$ 

\vskip.25in

\setlength{\fboxsep}{.75in}
\noindent \framebox[6.6in]{}


\end{document}