What color do you think the bridge is?
The bridge is yellow.
    src        edge_attr  dst
0     0               on    1
1     0  to the right of    3
2     0   to the left of    6
3     2  to the right of   14
4     2   to the left of   11
5     3  to the right of   14
6     3   to the left of    6
7     3   to the left of    0
8     5   to the left of    7
9     6  to the right of   11
10    6  to the right of    0
11    6  to the right of    3
12    7  to the right of    5
13   11  to the right of    2
14   11   to the left of    6
15   11  to the right of   14
16   14   to the left of    3
17   14   to the left of    2
18   14   to the left of   11