What is the plate in front of?
The plate is in front of the book.
   src        edge_attr  dst
0    0               on    3
1    2           behind    8
2    3               on    8
3    4   to the left of    7
4    4  to the right of    5
5    5   to the left of    4
6    6   to the left of    7
7    7  to the right of    4
8    7  to the right of    6
9    8      in front of    2