public Value flip(){
 		if(isFlippable){
 			
 			switch (this.value){
			case ONE : value = Value.SIX;break;
			case TWO : value = Value.FIVE;break;
			case THREE : value = Value.FOUR;break;
			case FOUR : value = Value.THREE;break;
			case FIVE : value = Value.TWO;break;
			case SIX : value = Value.ONE;break;
			default : value= Value.ERROR;break;
		}
		}
		isFlippable = false;
		
		return value;
 	}