Which place is it?
It is a pen.
    src        edge_attr  dst
0     1   to the left of   11
1     1   to the left of   13
2     4   to the left of    5
3     5  to the right of    4
4     6  to the right of    9
5     6   to the left of   11
6     7  to the right of   11
7     9   to the left of   13
8     9   to the left of    6
9     9   to the left of   11
10   11  to the right of    9
11   11  to the right of   13
12   11           eating   10
13   11  to the right of    1
14   11   to the left of    7
15   11  to the right of    6
16   13  to the right of    1
17   13           eating   10
18   13  to the right of    9
19   13   to the left of   11