What is common to the fence and the walkway?
The color, both the fence and the walkway are blue.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of    1
2     1   to the left of   15
3     1   to the left of    0
4     1   to the left of    2
5     1   to the left of   12
6     2   to the left of    6
7     2  to the right of    1
8     2   to the left of   10
9     2   to the left of    9
10    3               of    0
11    3  to the right of   15
12    4  to the right of   12
13    4   to the left of    6
14    4   to the left of   10
15    4   to the left of    9
16    4  to the right of   15
17    5   to the left of   15
18    5   to the left of    0
19    6  to the right of    9
20    6  to the right of   10
21    6   to the left of   16
22    6  to the right of    2
23    6               of    0
24    6  to the right of    4
25    9  to the right of    4
26    9   to the left of    6
27    9  to the right of   10
28    9  to the right of    2
29    9   to the left of   16
30    9               of    0
31   10  to the right of   15
32   10   to the left of    9
33   10   to the left of    6
34   10  to the right of   12
35   10  to the right of    4
36   10  to the right of    2
37   10   to the left of   16
38   10               of    0
39   12   to the left of   10
40   12  to the right of    1
41   12   to the left of    4
42   15   to the left of    3
43   15  to the right of    1
44   15   to the left of   10
45   15  to the right of    5
46   15   to the left of    4
47   16  to the right of   10
48   16               of    0
49   16  to the right of    6
50   16  to the right of    9