What is the black cow leaning over?
The cow is leaning over the rock.
    src        edge_attr  dst
0     4   to the left of   10
1     4   to the left of    9
2     4   to the left of   14
3     4   to the left of   13
4     5  to the right of   11
5     5  to the right of    7
6     6               on    0
7     6               in   12
8     7   to the left of    8
9     7   to the left of    5
10    8  to the right of    7
11    9   to the left of   10
12    9               on    3
13    9  to the right of    4
14   10  to the right of    4
15   10  to the right of    9
16   11   to the left of    5
17   11     leaning over    2
18   13               in   16
19   13  to the right of    4
20   14  to the right of    4