What do both the fence and the door have in common?
The material, both the fence and the door are wooden.
    src        edge_attr  dst
0     0      in front of    4
1     0          wearing    2
2     0  to the right of    5
3     0   to the left of    1
4     0  to the right of    7
5     0  to the right of    6
6     1  to the right of    2
7     1  to the right of    0
8     1  to the right of    3
9     2   to the left of    1
10    2  to the right of    6
11    3  to the right of    6
12    3  to the right of    4
13    3   to the left of    1
14    4           behind    0
15    4   to the left of    3
16    5   to the left of    0
17    6   to the left of    2
18    6   to the left of    0
19    6   to the left of    3
20    7               on    6
21    7   to the left of    0