Which color is the crust?
The crust is dark brown.
    src        edge_attr  dst
0     1             with    5
1     1             with    6
2     1   to the left of    2
3     2  to the right of    9
4     2  to the right of    1
5     2               on    9
6     2  to the right of    6
7     3   to the left of    6
8     5               on    1
9     5               on    0
10    6  to the right of    3
11    6   to the left of    2
12    6               on    1
13    7               on    0
14    9   to the left of    2