public boolean checkColumn (int col) {
		int i = 0, j = 0, count = 0;
        /* Uses nested for loops to check the entries in the column */
		for (j = 0; j < 10; j++) {
			count = 0;
			for (i = 0; i < 16; 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;
	}