:
The <tt>Symbol</tt> class.  The <tt>Symbol</tt> class has three instance
variables which 
are significant to the parser when passing information from the lexer.
The first is the <tt>value</tt> instance variable.  This variable 
contains the 
value of that terminal.  It is of the type declared as the terminal type
in the parser specification file.  The second two are the instance
variables <tt>left</tt> and <tt>right</tt>.  They should be filled with 
the <tt>int</tt> value of
where in the input file, char