How many Dune novels did Frank Herbert write?
6
6
6
6
6
6
3
6
5
3
6
5
3
6
5
3
6
5
3
6
5
3
4
6
5
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
6
5
2
7
3
4
13
5
2
7
3
4
8
13
5
1
9
2
7
3
4
8
13
5
1
9
2
7
3
4
8
13
5
1
9
2
7
3
4
8
13
5
0
1
9
2
7
4
8
13
1
9
2
12
7
4
8
13
1
9
2
12
7
4
8
13
1
9
2
12
7
4
8
13
1
9
2
12
7
4
8
13
1
9
2
12
7
8
13
1
9
2
12
8
13
1
9
12
61
10
8
13
1
9
12
10
14
8
13
1
9
12
11
10
14
8
13
1
9
12
11
10
14
69
62