Does the bridge appear to be gray or red?
The bridge is gray.
    src        edge_attr  dst
0     0               on    2
1     0            above   12
2     0  to the right of    8
3     0   to the left of    6
4     0   to the left of    7
5     0               at    0
6     1   to the left of    4
7     4   to the left of    6
8     4   to the left of    7
9     4  to the right of    1
10    4  to the right of    8
11    4   to the left of   10
12    5   to the left of    7
13    6  to the right of    0
14    6  to the right of    4
15    6  to the right of   12
16    6  to the right of   13
17    6   to the left of   10
18    7  to the right of    4
19    7  to the right of    5
20    7  to the right of   13
21    7  to the right of   12
22    7  to the right of    0
23    7               on    6
24    8   to the left of    4
25    8   to the left of   13
26    8   to the left of    0
27    8               at    0
28   10  to the right of    4
29   10  to the right of    6
30   12   to the left of    7
31   12   to the left of    6
32   13  to the right of    8
33   13   to the left of    6
34   13   to the left of    7