-Explanations :
-
-As we will use \texttt{Add} boxes, we need to load the package \texttt{std}, which is done in first line.
-
-The command \texttt{define} then starts the definition
-of the complex box type, which will be called \texttt{Add3}.
-
-The next three lines define the pipeline,
-exactly in the same way than outside a complex box definition.
-
-The commands \texttt{author}, \texttt{description}, \texttt{input}
-and \texttt{output} are commands specific to complex boxes definition :
-
-\texttt{author} and \texttt{description} are used for the documentation
+Explanations:
+\begin{itemize}
+ \item As we will use \texttt{Add} boxes, we need to load the package \texttt{std}, which is done in the first line.
+ \item The command \texttt{define} then starts the definition
+of the complex box type that will be called \texttt{Add3}.
+ \item The next three lines define the pipeline,
+exactly in the same way as outside a complex box definition.
+ \item The commands \texttt{author}, \texttt{description}, \texttt{input}
+and \texttt{output} are specific to complex boxes definition:
+ \begin{itemize}
+ \item \texttt{author} and \texttt{description} are used for the documentation