Are there white bridges in the picture?
No, there is a bridge but it is green.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of    4
2     1           beside    3
3     1   to the left of    5
4     1   to the left of    4
5     1   to the left of    6
6     1   to the left of   16
7     1   to the left of   18
8     1  to the right of   13
9     1  to the right of    8
10    1  to the right of   11
11    4  to the right of    1
12    4  to the right of    0
13    4  to the right of   16
14    5  to the right of    1
15    6   to the left of   10
16    6  to the right of    1
17    8   to the left of   16
18    8  to the right of   11
19    8   to the left of    1
20    8   to the left of   17
21   10  to the right of   16
22   10  to the right of    6
23   10   to the left of   15
24   11   to the left of   13
25   11   to the left of    1
26   11   to the left of    8
27   11   to the left of   14
28   11   to the left of   17
29   13   to the left of    1
30   13  to the right of   11
31   14  to the right of   11
32   15  to the right of   10
33   15  to the right of    0
34   16  to the right of    8
35   16  to the right of    1
36   16  to the right of   17
37   16   to the left of   10
38   16   to the left of    4
39   17   to the left of   16
40   17  to the right of    8
41   17  to the right of   11
42   17   to the left of   18
43   18  to the right of    1
44   18  to the right of   17