diff --git a/exercise_sheet.tex b/exercise_sheet.tex
index 36361a7..1d69f03 100644
--- a/exercise_sheet.tex
+++ b/exercise_sheet.tex
@@ -1,103 +1,104 @@
 \documentclass[a4wide]{article}
 
 \PassOptionsToPackage{usenames,dvipsnames}{xcolor}
+\usepackage[T1]{fontenc}
 \usepackage{beamerarticle}
 \usepackage{hyperref}
 
 \usepackage{tikz}
 \usepackage{onimage}
 
 \usepackage{booktabs}
 \usepackage{longtable}
 \usepackage{version}
 
 \def\labelitemi{--}
 
 \usetikzlibrary{trees}
 \usetikzlibrary{decorations.text}
 
 \hypersetup{
   pdftitle={Introduction to Linux},
   pdfauthor={http://scitas.epfl.ch},
   colorlinks=true,
   urlcolor=blue
 }
 
 \tikzset{
   invisible/.style={opacity=0},
   visible on/.style={alt={#1{}{invisible}}},
   alt/.code args={<#1>#2#3}{%
     \alt<#1>{\pgfkeysalso{#2}}{\pgfkeysalso{#3}} % \pgfkeysalso doesn't change the path
   },
 }
 
 
 \title{Introduction to Linux}
 \author{\url{scitas.epfl.ch}}
 \date{\today}
 
 \newcommand{\distroitem}[3]{%
   \item[]\vspace*{-1ex}\hspace*{-.3cm}\tikz[baseline]{%
       \node[anchor=base,text width=3ex, text centered]%
          (#2) at (0,-.1cm)%
            {\includegraphics[height=3ex, clip=true,trim=0 #1 0 0]{images/#2}};} #3}
 
 \newcounter{exercise}
 \setcounter{exercise}{0}
 \newenvironment*{exo}[1]%
 {\pagebreak[2]%
   \refstepcounter{exercise}\par%
   \noindent{\bf Exercise~\arabic{exercise}:~ \textit{#1}}\par}%
 {\bigskip}
 
 \usepackage{adjustbox}
 
 \newenvironment{extrainfos}%
 {\vspace{1ex}
   \begin{adjustbox}{minipage=[b]{0.9\linewidth},
       bgcolor={HTML}{EBF2F2},vspace=1ex 1ex,
       margin=2ex}}
 {\end{adjustbox}}
 
 \newenvironment{questions}%
 {\begin{itemize}}
   {\end{itemize}}
 
 \excludeversion{frame}
 \excludeversion{command}
 \excludeversion{block}
 
 \usepackage{upquote}
 
 \renewcommand{\note}[1]{}
 \renewcommand{\only}[1]{}
 
 \definecolor{colKeys}{rgb}{0,0,1}
 \definecolor{colIdentifier}{rgb}{0,0,0}
 \definecolor{colComments}{rgb}{0,.5,0}
 \definecolor{colString}{rgb}{1,0,0}
 \definecolor{colCppBg}{HTML}{EBF2F2}
 \definecolor{colShellBg}{HTML}{F5EDE4}
 
 \newcommand{\mybox}[2][fill=colShellBg]{%
   \tikz[baseline=-0.5ex] \node at (0,0) [#1,inner sep=2pt]{#2};}
 
 \newcommand{\code}[1]{\mybox{\texttt{#1}}}
 
 
 \begin{document}
 
 \noindent {\bf EPFL \hfill scitas.epfl.ch\\
   \hfill Exercise sheet} \hfill  \today\\[-0.3cm]
 \rule{\linewidth}{.3mm}
 \vspace*{0.5pt}
 \begin{center}
   {
     \LARGE \bfseries {\em Introduction to Linux}
     \bigskip
   }\\
 \end{center}
 
 \input{document}
 
-\end{document}
\ No newline at end of file
+\end{document}