\documentclass[a4paper]{article} 

\usepackage{beamerarticle}
\setjobnamebeamerversion{slides_beamer}

\usepackage{a4wide}
\usepackage[nonotes]{teachernotes}

\input{general_header.inc}

\newcommand{\showslide}[2][1]{
\begin{center} 
\fbox{\includeslide[width=.7\textwidth]{#2<#1>}}
\end{center}
}

\input{main.inc}