What is the fan on?
The fan is on the shelf.
    src        edge_attr  dst
0     0               on    4
1     1   to the left of   10
2     2   to the left of   10
3     3          next to    7
4     3   to the left of    7
5     3   to the left of   10
6     3   to the left of    6
7     3             near    7
8     6  to the right of    3
9     7  to the right of    3
10    7             near    3
11    8   to the left of   10
12    9   to the left of   10
13   10  to the right of    1
14   10  to the right of    2
15   10  to the right of    3
16   10  to the right of    8
17   10  to the right of    9