Are there any clocks that are not white?
Yes, there is a blue clock.
    src        edge_attr  dst
0     0  to the right of   11
1     1               on    2
2     1  to the right of    3
3     1  to the right of    4
4     3               on    2
5     3   to the left of    1
6     3  to the right of    4
7     4               on    2
8     4   to the left of    1
9     4   to the left of    3
10    5   to the left of   11
11    5               on    2
12    6               on    2
13    6   to the left of    9
14    7   to the left of    9
15    7               on    2
16    9  to the right of    6
17    9               on    8
18    9  to the right of   11
19    9  to the right of    7
20   10   to the left of   12
21   11               on    8
22   11   to the left of   14
23   11   to the left of    0
24   11   to the left of    9
25   11  to the right of    5
26   12  to the right of   10
27   14  to the right of   11
28   14   to the left of   16
29   16  to the right of   14