Are there either benches or clocks that are green?
Yes, the clock is green.
   src        edge_attr  dst
0    1  to the right of    5
1    1  to the right of   10
2    3   to the left of    6
3    5   to the left of    1
4    6  to the right of    3
5    8  to the right of   11
6    9               on    7
7   10   to the left of    1
8   11   to the left of    8