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