public static int getFaceNum(Face face){
		if(face==NORTHERN) return 0;
		else if(face==EASTERN) return 1;
		else if(face==SOUTHERN) return 2;
		else if(face==WESTERN) return 3;
		else if(face==FLOOR) return 4;
		else if(face==CEILING) return 5;
		return -1;
	}