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diff --git a/src/java_cup/simple_calc/parser.cup b/src/java_cup/simple_calc/parser.cup
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--- a/src/java_cup/simple_calc/parser.cup
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-/*
- * This file is part of Petascope.
- *
- * Petascope is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation, either version 3 of
- * the License, or (at your option) any later version.
- *
- * Petascope is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with Petascope. If not, see <http://www.gnu.org/licenses/>.
- *
- * For more information please see <http://www.Petascope.org>
- * or contact Peter Baumann via <baumann@rasdaman.com>.
- *
- * Copyright 2009 Jacobs University Bremen, Peter Baumann.
- */
-
-// JavaCup specification for a simple expression evaluator (w/ actions)
-
-package java_cup.simple_calc;
-
-import java_cup.runtime.*;
-
-/* Terminals (tokens returned by the scanner). */
-terminal           SEMI, PLUS, MINUS, TIMES, DIVIDE, MOD;
-terminal           UMINUS, LPAREN, RPAREN;
-terminal Integer   NUMBER;
-
-/* Non terminals */
-non terminal Object     expr_list, expr_part;
-non terminal Integer    expr;
-
-/* Precedences */
-precedence left PLUS, MINUS;
-precedence left TIMES, DIVIDE, MOD;
-precedence left UMINUS, LPAREN;
-
-/* The grammar */
-expr_list ::= expr_list expr_part 
-	      | 
-              expr_part;
-
-expr_part ::= expr:e 
-	      {: System.out.println("= " + e); :} 
-              SEMI              
-	      ;
-
-expr      ::= expr:e1 PLUS expr:e2    
-	      {: RESULT = new Integer(e1.intValue() + e2.intValue()); :} 
-	      | 
-              expr:e1 MINUS expr:e2    
-              {: RESULT = new Integer(e1.intValue() - e2.intValue()); :} 
-	      | 
-              expr:e1 TIMES expr:e2 
-	      {: RESULT = new Integer(e1.intValue() * e2.intValue()); :} 
-	      | 
-              expr:e1 DIVIDE expr:e2 
-	      {: RESULT = new Integer(e1.intValue() / e2.intValue()); :} 
-	      | 
-              expr:e1 MOD expr:e2 
-	      {: RESULT = new Integer(e1.intValue() % e2.intValue()); :} 
-	      | 
-              NUMBER:n                 
-	      {: RESULT = n; :} 
-	      | 
-              MINUS expr:e             
-	      {: RESULT = new Integer(0 - e.intValue()); :} 
-	      %prec UMINUS
-	      | 
-              LPAREN expr:e RPAREN     
-	      {: RESULT = e; :} 
-	      ;