What is the color of this plate?
The plate is blue.
   src        edge_attr  dst
0    1   to the left of    4
1    1  to the right of    2
2    1  to the right of    7
3    2   to the left of    1
4    3               on    1
5    4  to the right of    7
6    4  to the right of    1
7    6               by    8
8    7   to the left of    4
9    7   to the left of    1