public void setValueAt(Object value, int row, int column) {
		switch (column) {
		case 0:
			variables[row] = (String) value;
			break;
		case 1:
			firstSets[row] = removeDuplicateCharacters((String) value);
			break;
		case 2:
			followSets[row] = removeDuplicateCharacters((String) value);
			break;
		}
	}