What's attached to the wall?
The pipe is attached to the wall.
    src        edge_attr  dst
0     0  to the right of    3
1     1  to the right of    3
2     3   to the left of    0
3     3   to the left of    1
4     4  to the right of   10
5     4  standing behind    4
6     4  to the right of    8
7     5  to the right of    9
8     5  to the right of    6
9     6  to the right of    8
10    6   to the left of    5
11    6  to the right of   10
12    8   to the left of    9
13    8   to the left of    6
14    8   to the left of    4
15    9   to the left of    5
16    9  to the right of    8
17   10   to the left of    4
18   10   to the left of    6
19   10      attached to    8