What color is the bridge?
The bridge is teal.
    src        edge_attr  dst
0     2               of    4
1     2   to the left of    8
2     2   to the left of    9
3     3  to the right of    5
4     3               of    4
5     4  to the right of    5
6     5   to the left of    3
7     5   to the left of    7
8     5   to the left of    4
9     5   to the left of    9
10    7  to the right of    5
11    8               of    4
12    8  to the right of    2
13    9               of    4
14    9  to the right of    5
15    9  to the right of    2