What's on the mattress?
The sheet is on the mattress.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    3
2     0   to the left of    5
3     0   to the left of    7
4     1  to the right of   16
..  ...              ...  ...
77   17   to the left of   12
78   17  to the right of    8
79   19               on   11
80   19  to the right of    7
81   19  to the right of    5

[82 rows x 3 columns]