What color do you think the device in the middle is?
The mobile phone is white.
   src        edge_attr  dst
0    0   to the left of    2
1    0   to the left of    1
2    1  to the right of    0
3    1  to the right of    6
4    2  to the right of    6
5    2  to the right of    4
6    2  to the right of    0
7    4   to the left of    2
8    6   to the left of    2
9    6   to the left of    1