Are there any green cans or fences?
Yes, there is a green fence.
    src        edge_attr  dst
0     0   to the left of    6
1     1      approaching    8
2     1            below    5
3     1   to the left of   10
4     1  to the right of    9
5     2  to the right of    9
6     2   to the left of    7
7     3  to the right of   11
8     3  to the right of    8
9     6  to the right of    0
10    7  to the right of    2
11    7   to the left of   10
12    8   to the left of   10
13    8   to the left of    3
14    9   to the left of    1
15    9   to the left of   11
16    9   to the left of    2
17   10  to the right of   11
18   10  to the right of    8
19   10  to the right of    7
20   10  to the right of    1
21   11  to the right of    9
22   11   to the left of   10
23   11   to the left of    3