What device is not open?
The device is a charger.
   src        edge_attr  dst
0    0   to the left of    6
1    1   to the left of    5
2    4   to the left of    6
3    4               on    3
4    4  to the right of    7
5    5           beside    4
6    5  to the right of    1
7    6  to the right of    4
8    6  to the right of    0
9    7   to the left of    4