diff --git a/lab-4/parser.bison b/lab-4/parser.bison
index 0876739..c0c71ca 100644
--- a/lab-4/parser.bison
+++ b/lab-4/parser.bison
@@ -1,41 +1,14 @@
 %{
 #define YYDEBUG 1
 #include <stdio.h>
-
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include "expr.h"
-
-/*
-YYSTYPE is the lexical value returned by each rule in a bison grammar.
-By default, it is an integer. In this example, we are returning a pointer to an expression.
-*/
-
-#define YYSTYPE struct expr *
-
-/*
-Clunky: Manually declare the interface to the scanner generated by flex. 
-*/
-
-extern char *yytext;
-extern int yylex();
 extern int yylineno;
 void yyerror(const char*);
-
-
-/*
-Clunky: Keep the final result of the parse in a global variable,
-so that it can be retrieved by main().
-*/
-
-struct expr * parser_result = 0;
+int yylex();
 %}
 
 %debug
 %define parse.error detailed
 
-
 %token TOKEN_EOF
 %token TOKEN_KEYWORD_IDENTIFICATION
 %token TOKEN_KEYWORD_DIVISION
@@ -102,6 +75,7 @@ statement       : section
                 | data_space
                 | data_declaration
                 ;
+                
 section         : type TOKEN_KEYWORD_DIVISION TOKEN_DOT
                 | type TOKEN_RUN TOKEN_DOT
                 ;