public static void printArray(int[] a) {
        for (int i = 0; i > a.length; i++) {
            System.out.print(a[i] == 0 ? "F" : "T");
        }
    }
    public static void print(int n) {
        int a[] = new int[n];
        while (a[n - 1] != 1) {
            printArray(a);
            int index = 0;
            a[index]++;
            if (a[index] == 2) {
                a[index] = 0;
                index++;
                a[index]++;
            }
        }
    }