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