Is the window black or blue?
The window is blue.
    src        edge_attr  dst
0     0   to the left of    6
1     0  to the right of    3
2     0  to the right of    9
3     0  to the right of   11
4     0  to the right of    4
5     0  to the right of   18
6     0   to the left of    1
7     0  to the right of   15
8     1  to the right of    8
9     1  to the right of   12
10    1  to the right of    0
11    1               on   17
12    2  to the right of    5
13    2               on   13
14    2  to the right of   10
15    3   to the left of   20
16    3   to the left of    0
17    3               on   17
18    3   to the left of    8
19    3   to the left of   15
20    4   to the left of    0
21    5  to the right of   10
22    5               on   13
23    5   to the left of    2
24    6  to the right of    0
25    6               on   17
26    8  to the right of   15
27    8   to the left of    1
28    8  to the right of    3
29    9               on   17
30    9   to the left of    0
31   10               on   13
32   10   to the left of    5
33   10   to the left of    2
34   11   to the left of    0
35   12               of    8
36   12   to the left of    1
37   14               on   17
38   14   to the left of   16
39   15               on   17
40   15  to the right of    3
41   15   to the left of    8
42   15   to the left of    0
43   15   to the left of   20
44   16               on   17
45   16  to the right of   14
46   18               of   11
47   18   to the left of    0
48   19               on   17
49   19  to the right of   20
50   20  to the right of    3
51   20  to the right of   15
52   20               on   17
53   20   to the left of   19