What color is the sheet in the bottom?
The sheet is blue.
    src        edge_attr  dst
0     0   to the left of    2
1     1   to the left of    6
2     2  to the right of    5
3     2  to the right of    4
4     2  to the right of   13
5     2  to the right of   11
6     2  to the right of    0
7     2  to the right of   15
8     3  to the right of   14
9     4   to the left of    2
10    5   to the left of    2
11    5   to the left of   12
12    5       covered by    6
13    6               on    5
14    6  to the right of    1
15    6         covering    5
16    6  to the right of   14
17    6   to the left of   12
18    8  to the right of   15
19    8  to the right of   13
20    9  to the right of   10
21    9  to the right of   11
22    9  to the right of   13
23    9  to the right of   15
24   10               on   13
25   10   to the left of    9
26   11   to the left of    2
27   11   to the left of    9
28   12  to the right of    6
29   12  to the right of    5
30   13   to the left of    2
31   13   to the left of    9
32   13   to the left of    8
33   14   to the left of    3
34   14   to the left of    6
35   15   to the left of    9
36   15               of   13
37   15   to the left of    2
38   15   to the left of    8