Are there any windows or clocks?
Yes, there is a window.
    src        edge_attr  dst
0     0  to the right of    6
1     1  to the right of    6
2     1   to the left of    4
3     1   to the left of    2
4     2  to the right of    6
5     2  to the right of    1
6     4  to the right of    1
7     6   to the left of    1
8     6   to the left of    0
9     6   to the left of    2
10    8             near    9
11    9             near    8