Are there any bicycles?
Yes, there is a bicycle.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of    9
2     1   to the left of    7
3     2  to the right of   10
4     2  to the right of    9
5     5   to the left of    7
6     6   to the left of    8
7     7  to the right of    5
8     7  to the right of    1
9     8  to the right of    6
10    9  to the right of    0
11    9   to the left of    2
12   10  to the right of    0
13   10   to the left of    2