How many countries start with the letter “O”?
1
1
1
1
1
1
1
1
1
1
2
1
3
2
1
3
2
1
3
2
1
3
4
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
1
3
4
5
2
3
4
5
2
3
4
5
6
2
3
4
5
6
2
3
4
5
6
2
3
4
5
6
2
3
4
5
6
2
3
7
4
5
6
2
3
7
4
5
6
2
3
7
4
5
6
7
8
4
5
6
7
8
4
5
6
7
8
4
5
6
7
8
5
6
11
7
8
6
11
9
7
8
6
11
9
7
8
6
11
9
10
7
8
6
11
9
10
7
8
6
11
9
10
7
8
6
11
9
10
7
8
6
11
9
10
7
8
13
6
11
9
10
7
8
13
11
9
10
12
7
8
13
11
9
10
12
7
8
13
11
9
10
12
7
8
13
128
128
128
128
2 countries