Is the dirty box black or blue?
The box is blue.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of   11
2     1   to the left of   11
3     1   to the left of    4
4     2  to the right of    0
5     3               in    9
6     3  to the right of    7
7     3  to the right of    4
8     3  to the right of   11
9     3  to the right of    8
10    4  to the right of    1
11    4   to the left of    3
12    4   to the left of    9
13    5               on    4
14    6   to the left of    9
15    7   to the left of    9
16    7   to the left of    3
17    7   to the left of    8
18    8         sniffing    9
19    8   to the left of    3
20    8  to the right of    7
21    8  to the right of   11
22    9  to the right of   11
23    9  to the right of    7
24    9  to the right of    6
25    9  to the right of    4
26   11   to the left of    8
27   11   to the left of    9
28   11  to the right of    0
29   11   to the left of    3
30   11  to the right of    1