Where is this?
This is at the pasture.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of    3
2     1   to the left of    0
3     1   to the left of    5
4     1   to the left of   14
5     1   to the left of   13
6     3   to the left of    7
7     3   to the left of    5
8     3   to the left of   14
9     3   to the left of   13
10    3   to the left of    0
11    5  to the right of    1
12    5  to the right of    3
13    7  to the right of    3
14   13             with   14
15   13  to the right of    3
16   13  to the right of    1
17   14  to the right of    1
18   14  to the right of    3