What is touching the wall?
The trunk is touching the wall.
    src         edge_attr  dst
0     0    to the left of    4
1     0   to the right of    1
2     1    to the left of    0
3     1    to the left of    4
4     2    to the left of    8
5     2    to the left of   13
6     2    to the left of    5
7     2   to the right of   10
8     2   to the right of    7
9     3    to the left of    4
10    4   to the right of    3
11    4   to the right of    1
12    4   to the right of   13
13    4   to the right of    0
14    4   to the right of    6
15    5   to the right of    9
16    5          touching   12
17    5   to the right of    8
18    5   to the right of    2
19    6    to the left of    4
20    7    to the left of    2
21    7    to the left of    9
22    7              near   10
23    7    to the left of    8
24    8    to the left of    5
25    8   to the right of   10
26    8   to the right of    7
27    8   to the right of   11
28    8   to the right of    2
29    8    to the left of   13
30    9   to the right of    7
31    9   to the right of   11
32    9    to the left of   13
33    9    to the left of    5
34   10  standing next to    7
35   10                on    2
36   10           next to    7
37   10    to the left of    8
38   10    to the left of    2
39   11    to the left of    8
40   11    to the left of    9
41   13   to the right of    2
42   13   to the right of    8
43   13   to the right of    9
44   13    to the left of    4