public void setSet(Set set, int row, int column) {
		StringBuffer sb = new StringBuffer();
		Iterator it = set.iterator();
		while (it.hasNext()) {
			String element = (String) it.next();
			if (element.length() == 0)
				element = "!";
			sb.append(element);
		}
		setValueAt(sb.toString(), row, column);
	}