What does the brown cat sit on?
The cat sits on the mat.
    src        edge_attr  dst
0     2   to the left of   11
1     2   to the left of    7
2     2  to the right of   12
3     3   to the left of    7
4     5   to the left of   11
5     7       sitting on    3
6     7  to the right of    2
7     7  to the right of    8
8     7  to the right of    3
9     7  to the right of   11
10    8       sitting on    3
11    8        on top of    3
12    8               on   10
13    8   to the left of    7
14   11  to the right of    5
15   11  to the right of    2
16   11   to the left of    7
17   11  to the right of   12
18   12   to the left of    2
19   12   to the left of   11