How hard is the thick frosting?
The frosting is hard.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    9
2     0  to the right of   11
3     0  to the right of   12
4     1   to the left of   14
5     1   to the left of   15
6     3   to the left of   15
7     3   to the left of   14
8     3   to the left of    4
9     4  to the right of   14
10    4  to the right of    3
11    4  to the right of   15
12    5  to the right of   14
13    5  to the right of   15
14    5               on    4
15    8  to the right of   13
16    8  to the right of    0
17    9               in    2
18    9  to the right of    0
19    9  to the right of   13
20   11   to the left of   13
21   11   to the left of    0
22   12   to the left of    0
23   12   to the left of   14
24   13   to the left of    8
25   13   to the left of    9
26   13  to the right of   11
27   14  to the right of    1
28   14  to the right of   12
29   14   to the left of    5
30   14   to the left of    4
31   14  to the right of    3
32   15   to the left of    5
33   15  to the right of    1
34   15  to the right of    3
35   15   to the left of    4