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\documentclass[12pt,a4paper,twoside]{article}
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\usepackage{amssymb,amsmath,graphicx}
% The beginning of the document...
\begin{document}
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\centerline{\large Exercises: Week 135}\vspace{0.5em}
\centerline{\large by Susy X and Simon Y}\vspace{2em}
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\section*{Exercise 1}
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Here are the plots:\\
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%\includegraphics[width=14cm]{plot.ps}
\section*{Exercise 2}
The computer program we wrote in Fortran-90:
% The "verbatim" mode is used to get output exactly as it is inputted
\begin{verbatim}
program myprog
implicit none
real :: a
read(*,*) a
....
....
....
end program
\end{verbatim}
The results for $a=5$ were:
\begin{verbatim}
5
6
7
3
2
\end{verbatim}
\section*{Exercise 2}
The following equation was solved...
% Equations can be written in the "equation" mode as follows
\begin{equation}
x^2+x+c=0
\end{equation}
\end{document}