On which side is the green curtain?
The curtain is on the right of the image.
    src        edge_attr  dst
0     0            under    6
1     0               on    2
2     0            below    6
3     0   to the left of    9
4     1  to the right of    5
5     1  to the right of    2
6     1  to the right of    6
7     1  to the right of    9
8     2   to the left of    1
9     5   to the left of    7
10    5   to the left of    1
11    6   to the left of    7
12    6   to the left of    1
13    6               on    0
14    6            above    0
15    7  to the right of    5
16    7  to the right of    6
17    8  to the right of    9
18    9  to the right of    0
19    9   to the left of    8
20    9   to the left of    1