public String toTUIString(){
    	switch (this){
    	case SIX:
    		return "6";
    	case SEVEN:
    		return "7";
    	case EIGHT:
    		return "8";
    	case NINE:
    		return "9";    		
    	case TEN:
    		return "10";
    	case JACK:
    		return "J";
    	case QUEEN:
    		return "Q";
    	case KING:
    		return "K";    		
    	case ACE:
    		return "A";    		
    	}
    	return null;
    }