How many books are in Dune series?
15
3
5
3
5
3
5
3
5
4
3
5
4
3
5
4
3
5
6
4
7
3
5
6
4
7
2
3
5
6
4
7
2
3
5
6
4
7
2
3
5
6
4
7
2
3
5
6
4
7
2
3
5
6
4
8
7
2
3
5
6
4
8
7
2
3
5
6
4
8
7
1
2
3
5
6
4
8
7
1
13
9
2
3
5
6
4
8
7
1
13
9
2
3
5
6
4
8
12
7
10
1
13
9
2
3
5
6
4
8
12
7
10
1
13
9
2
3
5
6
4
8
12
11
7
10
1
13
9
2
6
4
8
12
11
7
10
1
13
9
2
6
4
8
12
11
7
10
1
13
9
2
6
4
8
12
11
7
10
1
13
9
2
6
8
12
11
7
10
1
13
9
2
6
8
12
11
7
10
1
13
9
2
6
8
12
11
7
10
1
13
9
2
14
8
12
11
10
1
13
9