What is on the refrigerator?
The cabinet is on the fridge.
    src        edge_attr  dst
0     0  to the right of    3
1     0  to the right of    6
2     2  to the right of    3
3     3  to the right of    7
4     3   to the left of    2
5     3   to the left of    0
6     3  to the right of    5
7     3   to the left of    4
8     4  to the right of    3
9     4       mounted on    0
10    5   to the left of    3
11    6   to the left of    0
12    6               on    3
13    7   to the left of    3