What is on the table?
The books are on the table.
    src        edge_attr  dst
0     0               on   11
1     2               on    0
2     2               on   10
3     3  to the right of    4
4     4   to the left of    3
5     4   to the left of    7
6     7  to the right of    4
7    10               on    9
8    10               on   11
9    10            above   11
10   11            under   10