Do you see green doors or trains?
Yes, there is a green door.
    src        edge_attr  dst
0     0  to the right of    2
1     0             near    1
2     0  to the right of    3
3     0  to the right of    1
4     1             near    0
5     1   to the left of    0
6     1   to the left of    2
7     1   to the left of    3
8     2   to the left of    0
9     2  to the right of    1
10    3  to the right of    1
11    3   to the left of    0
12    3  to the right of    4
13    4   to the left of    3