What is on the clock?
The letter is on the clock.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    3
2     0   to the left of    4
3     1   to the left of   13
4     2   to the left of   13
5     3   to the left of    8
6     3               on   11
7     3  to the right of    0
8     4  to the right of    0
9     5               on   11
10    5   to the left of    7
11    5  to the right of    6
12    6               on   11
13    6   to the left of    7
14    6   to the left of    5
15    7  to the right of    5
16    7  to the right of    6
17    8  to the right of    3
18    8  to the right of    0
19   11   to the left of   13
20   13  to the right of    1
21   13  to the right of   11
22   13  to the right of    2