Is the dirt white and covered?
No, the dirt is covered but brown.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    7
2     1  to the right of    7
3     2   to the left of    3
4     2   to the left of    0
5     3  to the right of    2
6     3  to the right of    7
7     4   to the left of    6
8     4  to the right of    5
9     5   to the left of    4
10    6  to the right of    7
11    6  to the right of    4
12    7               on    6
13    7               on    4
14    7   to the left of    1
15    7   to the left of    0
16    7   to the left of    6
17    7   to the left of    3