Do you see any boxes on top of the cake?
No, there is a walnut on top of the cake.
    src        edge_attr  dst
0     0  to the right of   16
1     0  to the right of    9
2     0  to the right of    5
3     0   to the left of    6
4     1  to the right of    3
..  ...              ...  ...
75   16      in front of   15
76   16   to the left of    0
77   16   to the left of    3
78   16   to the left of    7
79   16   to the left of   13

[80 rows x 3 columns]