Are there any desks?
Yes, there is a desk.
   src        edge_attr  dst
0    0            under    4
1    0   to the left of    3
2    0            below    4
3    1  to the right of    3
4    3  to the right of    4
5    3   to the left of    1
6    3  to the right of    0
7    4   to the left of    3
8    4            above    0