Which place is it?
It is an ocean.
   src        edge_attr  dst
0    0   to the left of    4
1    1   to the left of    4
2    2   to the left of    4
3    3   to the left of    4
4    4  to the right of    3
5    4  to the right of    2
6    4  to the right of    0
7    4  to the right of    1