Is the curtain on the left side?
Yes, the curtain is on the left of the image.
    src        edge_attr  dst
0     0   to the left of   20
1     0               on    1
2     1   to the left of   15
3     1  to the right of   10
4     1  to the right of    3
5     1   to the left of    2
6     1  to the right of    4
7     1  to the right of   18
8     1   to the left of   12
9     2  to the right of    1
10    2   to the left of   16
11    3   to the left of    1
12    4   to the left of   20
13    4   to the left of    1
14    4   to the left of   17
15    4   to the left of   18
16    4             near   14
17    5   to the left of   20
18    6  to the right of    7
19    7           beside   20
20    7   to the left of    6
21    8  to the right of   11
22    9  to the right of   15
23    9  to the right of   20
24   10   to the left of    1
25   10       hanging in    9
26   11   to the left of    8
27   11   to the left of   20
28   12  to the right of    1
29   14             near    4
30   14  to the right of   20
31   15   to the left of    9
32   15  to the right of    1
33   16  to the right of    2
34   17  to the right of    4
35   17   to the left of   20
36   17               on    1
37   18               of   18
38   18   to the left of    1
39   18  to the right of    4
40   18   to the left of   20
41   20  to the right of    0
42   20  to the right of   18
43   20  to the right of   11
44   20  to the right of   17
45   20  to the right of    4
46   20  to the right of    5
47   20   to the left of    9
48   20   to the left of   14