What are the books on?
The books are on the carpet.
    src        edge_attr  dst
0     0               on    1
1     0   to the left of   14
2     0   to the left of    6
3     2  to the right of    9
4     2               on    4
5     2   to the left of   11
6     3               on    1
7     4  to the right of    9
8     4   to the left of   11
9     5  to the right of    8
10    5               on    1
11    5         lying on    1
12    5      sleeping on    1
13    5   to the left of    7
14    6  to the right of    0
15    6      in front of   11
16    7  to the right of    5
17    7               on    1
18    8   to the left of    5
19    9   to the left of    4
20    9   to the left of    2
21   10               on    6
22   10     hanging from    6
23   11  to the right of    4
24   11  to the right of    2
25   11           behind    6
26   13               on    6
27   13  to the right of   14
28   14  to the right of    0
29   14   to the left of   13