Which kind of device is gray?
The device is a television.
   src        edge_attr  dst
0    0  to the right of    4
1    0  to the right of    3
2    1  to the right of    3
3    3   to the left of    4
4    3   to the left of    1
5    3   to the left of    0
6    4  to the right of    3
7    4   to the left of    0