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