Could this place be a beach?
Yes, it is a beach.
   src        edge_attr  dst
0    0  to the right of    2
1    0  to the right of    3
2    2   to the left of    0
3    3   to the left of    0
4    3  to the right of    5
5    5   to the left of    3
6    5   to the left of    6
7    6  to the right of    5
8    6  to the right of    7
9    7   to the left of    6