What do the sign and the bicycle have in common?
The color, both the sign and the bicycle are blue.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of   10
2     1   to the left of    4
3     1  to the right of   10
4     1  to the right of   16
5     2               on   17
6     2               on    0
7     3  to the right of   11
8     3  to the right of   14
9     4  to the right of   16
10    4  to the right of    1
11    4               by    9
12    6  to the right of    7
13    6  to the right of   20
14    7   to the left of    6
15    7  to the right of   12
16    7   to the left of   20
17    7  to the right of   15
18    8               by    7
19    8   to the left of   15
20    8  to the right of    0
21    9      in front of   15
22   10   to the left of   16
23   10               in   18
24   10   to the left of    1
25   10  to the right of    0
26   11   to the left of    3
27   12   to the left of    7
28   14               in   18
29   14   to the left of    3
30   15           behind    9
31   15   to the left of    7
32   15  to the right of    8
33   16   to the left of    1
34   16   to the left of   19
35   16   to the left of    4
36   16  to the right of   10
37   19  to the right of   16
38   19               on    1
39   20   to the left of    6
40   20  to the right of    7