What do both the plane and the door have in common?
The material, both the plane and the door are metallic.
    src        edge_attr  dst
0     0  to the right of    1
1     1  to the right of    2
2     1   to the left of    0
3     1   to the left of    7
4     1  to the right of    5
5     2   to the left of    1
6     5   to the left of    7
7     5   to the left of    1
8     7  to the right of    1
9     7  to the right of    5
10    7               by    3