\section{Lexing \& parsing}
%On March 10 you have to give a very brief presentation.  In this presentation you tell the other
%students and us how your parser is constructed and demonstrate your parser and pretty printer.
%You should mention things like implementation language used, changes to the grammar, and other
%interesting points of your program.
%For this demonstration you have to prepare at least 10 test programs in
%SPL
%. In your presentation
%you  have  to  show  only  the  most  interesting  or  challenging  example.   You  can  use  the  program
%4
%above as a starting point.  Hand in the test programs, and a document containing the transformed
%grammar as used by your parser.  Indicate what parts of the semantic analysis are handled by your
%scanner
