Is there a clock in the image?
No, there are no clocks.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    7
2     0   to the left of    4
3     0   to the left of    3
4     1   to the left of    4
5     1   to the left of    5
6     1   to the left of    3
7     2             near    3
8     3          next to    2
9     3  to the right of    1
10    3  to the right of    0
11    4  to the right of    0
12    4  to the right of    1
13    5  to the right of    1
14    6  to the right of    0
15    7  to the right of    0