Is the floor dirty?
Yes, the floor is dirty.
    src        edge_attr  dst
0     0   to the left of    2
1     1   to the left of    2
2     1   to the left of    3
3     2  to the right of    1
4     2  to the right of    0
5     3  to the right of    1
6     4               in    4
7     4  to the right of    6
8     4  to the right of    5
9     5   to the left of    4
10    5   to the left of    6
11    6   to the left of    4
12    6  to the right of    5