Are there clocks in the image?
Yes, there is a clock.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of    7
2     0  to the right of    5
3     1   to the left of    0
4     2               on    4
5     5   to the left of    0
6     6   to the left of    7
7     6   to the left of    8
8     7   to the left of    0
9     7  to the right of    6
10    8               on    4
11    8  to the right of    6