How many countries were involved in the Vietnam War?
10
3
3
3
3
3
3
4
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
3
4
5
3
2
4
5
3
2
7
4
5
6
3
2
7
4
1
5
6
3
2
7
4
1
5
6
3
2
7
4
1
5
6
3
2
7
4
1
5
6
3
2
7
4
1
5
6
3
2
7
4
1
5
6
2
7
4
1
5
6
2
7
4
1
5
6
2
7
4
1
5
6
2
8
7
4
1
5
6
2
8
7
4
1
5
6
2
8
7
1
5
6
9
2
8
7
1
6
9
62
2
8
7
1
6
9
2
8
7
1
62
11
13
6
12
9
58
2
8
61
7
1
11
13
62
6
12
9
63
2
8
7
58
1
14
11
61
13
6
12
9
62
2
8
57
7
1
14
63
11
13
58
10
6
12
66
61
9
8
0
7
1
14
62
59
11
57
13
71
10
25
63
6
12
9
58
8