What is the color of the book in the bottom part?
The book is blue.
    src        edge_attr  dst
0     0   to the left of    6
1     1  to the right of   10
2     1   to the left of    8
3     2  to the right of    6
4     2               on    4
5     2  to the right of    5
6     5   to the left of    2
7     6   to the left of    8
8     6  to the right of    0
9     6  to the right of   11
10    6   to the left of    2
11    7  to the right of   12
12    7  to the right of   13
13    8  to the right of    1
14    8  to the right of    6
15    8  to the right of   10
16    9  to the right of   13
17    9  to the right of   10
18    9  to the right of   14
19   10   to the left of    9
20   10   to the left of    1
21   10   to the left of    8
22   11   to the left of   15
23   11   to the left of    6
24   12  to the right of   13
25   12   to the left of    7
26   12  to the right of   14
27   13   to the left of    7
28   13  to the right of   14
29   13   to the left of   12
30   13   to the left of    9
31   14   to the left of    9
32   14   to the left of   15
33   14   to the left of   12
34   14   to the left of   13
35   15  to the right of   14
36   15  to the right of   11