public boolean isLetter(int token) {
		return (token >= 0x41 && token <= 0x5A || token >= 0x61
				&& token <= 0x7A || token >= 0xC0 && token <= 0xD6
				|| token >= 0xD8 && token <= 0xF6 || token >= 0xF8
				&& token <= 0xFF);
	}