How many books are in CS Lewis' Cosmic Trilogy?
3
3
3
3
3
3
3
3
5
4
3
5
4
3
5
4
2
3
5
4
2
3
5
4
2
3
5
4
2
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
6
2
1
3
5
4
6
2
1
7
3
5
4
6
2
1
7
3
5
4
6
2
1
7
5
4
6
2
1
7
0
5
4
6
2
1
7
5
4
6
2
1
7
5
4
6
2
1
7
5
4
6
2
1
7
5
4
6
2
1
7
8
6
2
1
7
8
6
2
1
7
8
6
1
9
7
8
6
1
9
7
8
10
6
1
9
7
8
10
6
1
9
7
13
12
11
8
10
6
9
7
13
12
11
8
10
6
9
7
13
12
11
8
10
6
9
7
13
12
11
8
10
6
9
7
13
12
11
8
10
9
7
13
12
11
8
10
9
13
12
11
8
10
66
132
144
3 books
123
116