private int getSenseCondition() {
		char read = (char) readAhead;
		int s = -1;
		switch(read) {
		case'F': case'f':	
			break;
		case'H': case'h':
			break;
		case'M': case'm':
			break;
		case'R': case'r':
			break;
		default:
			break;
		}
		return s;
	}