What color is the water that looks calm?
The water is gray.
    src        edge_attr  dst
0     0   to the left of    2
1     2  to the right of    0
2     5  to the right of    7
3     5  to the right of   12
4     6  to the right of   11
5     7   to the left of    5
6     7   to the left of    8
7     8  to the right of   10
8     8  to the right of    7
9    10   to the left of    8
10   11   to the left of    6
11   11   to the left of   13
12   12   to the left of    5
13   13  to the right of   11