What is the icing on?
The icing is on the donut.
    src        edge_attr  dst
0     0               of    6
1     0  to the right of    7
2     3          holding   10
3     4               on    5
4     4               on    6
5     5               on   10
6     5   to the left of   12
7     6   to the left of   12
8     6             with    5
9     6               on    1
10    6   to the left of   11
11    6             with    4
12    7   to the left of    0
13   10             with    4
14   10               in    3
15   10            above   12
16   11               on    6
17   11  to the right of    6
18   12  to the right of    5
19   12  to the right of    6
20   12            under   10