Is there any keyboard to the left of the computer?
Yes, there is a keyboard to the left of the computer.
   src        edge_attr  dst
0    0   to the left of    2
1    0   to the left of    1
2    0   to the left of    4
3    1   to the left of    2
4    1  to the right of    0
5    2  to the right of    0
6    2  to the right of    1
7    4  to the right of    0