Are there any black pillows?
Yes, there is a black pillow.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    5
2     0   to the left of   10
3     0               by    5
4     1  to the right of    3
5     2   to the left of   12
6     3   to the left of    1
7     3  to the right of    9
8     4  to the right of   10
9     4  to the right of   12
10    5  to the right of    9
11    5  to the right of    0
12    6  to the right of    0
13    6  to the right of    9
14    9   to the left of    5
15    9   to the left of    6
16    9   to the left of   10
17    9   to the left of    3
18   10   to the left of    4
19   10  to the right of    0
20   10  to the right of    9
21   12   to the left of    4
22   12  to the right of    2