What is the dog lying on?
The dog is lying on the couch.
    src        edge_attr  dst
0     0         lying on    3
1     0               on    3
2     1  to the right of   10
3     2               on    3
4     2        on top of    3
5     2   to the left of    8
6     2   to the left of    4
7     4  to the right of    2
8     6   to the left of   11
9     7  to the right of   11
10    8  to the right of    2
11    8               on    5
12    9               on    7
13    9  to the right of   11
14   10   to the left of   11
15   10   to the left of    1
16   11   to the left of    9
17   11  to the right of    6
18   11   to the left of    7
19   11               on    7
20   11  to the right of   10