Does the icing have brown color?
No, the icing is white.
    src        edge_attr  dst
0     2   to the left of    8
1     3  to the right of   10
2     4               on    5
3     4   to the left of    8
4     4   to the left of    9
5     5               on   12
6     8  to the right of    4
7     8               on    5
8     8  to the right of   10
9     8  to the right of    2
10    9               on    5
11    9  to the right of    4
12    9  to the right of   10
13   10   to the left of    3
14   10   to the left of    8
15   10   to the left of    9
16   13               on   10
17   13   to the left of   14
18   14  to the right of   15
19   14  to the right of   13
20   15   to the left of   14