Where is the dog standing on?
The dog is standing on the pier.
    src        edge_attr  dst
0     2   to the left of    6
1     2  to the right of    3
2     2  to the right of   15
3     2   to the left of   14
4     3   to the left of    2
5     3   to the left of   14
6     4   to the left of   13
7     5   on the edge of    1
8     6  to the right of   14
9     6  to the right of    2
10   10      standing on    5
11   10          wearing    7
12   13  to the right of    4
13   14  to the right of   15
14   14   to the left of    6
15   14  to the right of    2
16   14  to the right of    3
17   15   to the left of   14
18   15   to the left of    2