What color does the curtain that is to the left of the other curtain have?
The curtain has yellow color.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    3
2     1               on    5
3     1  to the right of    7
4     1   to the left of    4
5     2  to the right of    7
6     3   to the left of    9
7     3  to the right of    0
8     4               on    2
9     4  to the right of    1
10    4  to the right of    5
11    5   to the left of    4
12    5  to the right of    7
13    6  to the right of    0
14    7   to the left of    5
15    7               on    7
16    7   to the left of    2
17    7   to the left of    1
18    9  to the right of    3