What is on the shelf?
The towels are on the shelf.
    src       edge_attr  dst
0     0  to the left of    7
1     0  to the left of    1
2     0  to the left of    8
3     1  to the left of    8
4     1  to the left of    7
..  ...             ...  ...
77   22           above    4
78   22           above    5
79   22           above    2
80   22           above    3
81   22           above    6

[82 rows x 3 columns]