/**
   The objects of this class are productions of context-free grammars.
*/
public class Production{
    /**
       The left side (a variable).
    */
    char left;
    /**
       The right side (a string of terminals and variables).
    */
    String right;
    /**
       Creates a production <code>c -> s</code> with left side 
       <code>c</code> and right side <code>s</code>.
    */
    public Production(char c,String s){
	left=c;
	right=s;
    }

    public String toString(){
	return left + "->" + right;
    }
}