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+\subsection{Syntactic rules for input specification}\label{sect:spec}
+
+\vskip 0.2cm
+The input data to any module is read in free format using the subroutine 
+{\tt REDGET}. CLE-2000 variables\cite{ganlib5,cle2000} are also allowed.
+The user guide for DONJON is written using the following convention:
+
+\begin{itemize}
+
+\item the parameters surrounded by single square brackets `$[\;]$' 
+denote an optional input;
+
+\item the parameters surrounded by double square brackets `$[[\;]]$' 
+denote an input which may be repeated as many times as needed;
+
+\item the parameters in braces separated by vertical bars `$\{\; |\; |\; \}$' 
+denote a choice where one and {\sl only} one input is mandatory;
+
+\item the parameters in {\bf{bold face}} and in brackets `( )' 
+denote an input structure;
+
+\item the parameters in italics and in brackets with an index 
+`({\it data}(i) ,  i = 1, n )' denote a set of n inputs;
+
+\item the words using the typewriter font {\tt KEYWORD} are
+character constants used as keywords;
+
+\item the words in italics denote the user-defined variables:
+they are lower-case and of integer type (when starting from
+{\it i} to {\it n}), or of real type (when starting from {\it a} to {\it h} or from
+{\it o} to {\it z}); or they are upper-case and of character type {\it CHARACTER}.
+
+\end{itemize}