What's on the book?
The scissors are on the book.
    src    edge_attr  dst
0     0           on    9
1     1           on    9
2     2           on    9
3     4           on    9
4     5           on    9
5     6       behind    9
6     7  in front of    9
7     8       behind    9
8     9           on    3
9     9       behind    7
10    9  in front of    8
11    9  in front of    6