What is that number on?
The number is on the clock.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    1
2     1   to the left of    0
3     1   to the left of    2
4     1  to the right of    6
5     2  to the right of    1
6     2  to the right of    6
7     2  to the right of    5
8     3               on    6
9     5   to the left of    2
10    6   to the left of    2
11    6   to the left of    0
12    6   to the left of    1