What color is the sticker?
The sticker is black.
   src        edge_attr  dst
0    3  to the right of    5
1    5   to the left of    3
2    6   to the left of   12
3    7               on   16
4    9   to the left of   12
5    9  to the right of   18
6   11               on   10
7   12  to the right of    6
8   12  to the right of    9
9   18   to the left of    9