Is this toothbrush white or blue?
The toothbrush is blue.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    4
2     0               on    4
3     1  to the right of    2
4     1               on    4
5     1  to the right of    4
6     2   to the left of    3
7     2   to the left of    1
8     2  to the right of    4
9     2   to the left of    0
10    2               on    4
11    3               on    4
12    3  to the right of    4
13    3               on    1
14    3  to the right of    2
15    3               on    0
16    4   to the left of    0
17    4   to the left of    2
18    4   to the left of    3
19    4   to the left of    1