Which place is it?
It is a pen.
    src        edge_attr  dst
0     2  to the right of    5
1     2  to the right of    7
2     3   to the left of    6
3     5   to the left of    6
4     5               in    4
5     5   to the left of    2
6     6  to the right of    3
7     6  to the right of    5
8     6  to the right of    7
9     7   to the left of    6
10    7   to the left of    2