public boolean checkColumn(int col) {
		int count = 0;
		for(int j = 0; j < 10; j++) {
			count = 0;
			for(int i = 0; i < 9; i++) {
				if(j == Integer.parseInt(entries[i][col].getText())) {
					count++;
				}
				if(count >= 2) {
					System.out.println("checkColumn() returned false at i: " + i + " j: " + col + " with " + entries[i][col].getText());
					return false;
				}
			}
		}
		return true;
	}