Which place is it?
It is a stage.
    src        edge_attr  dst
0     0  to the right of    8
1     2   to the left of   11
2     5  to the right of    9
3     5          holding    4
4     5   to the left of    6
5     6  to the right of    5
6     7   to the left of   10
7     8   to the left of    0
8     9   to the left of    5
9    10  to the right of    7
10   11  to the right of    2