What are the books on?
The books are on the shelf.
    src        edge_attr  dst
0     0  to the right of   13
1     0   to the left of    8
2     0  to the right of   10
3     1   to the left of    7
4     2   to the left of    7
5     3   to the left of    8
6     3  to the right of   13
7     3  to the right of   10
8     4   to the left of    7
9     5  to the right of   15
10    5       covered by   11
11    5  to the right of   13
12    5   to the left of    8
13    6  to the right of   10
14    6  to the right of   13
15    6   to the left of    8
16    6   to the left of    9
17    7  to the right of    1
18    7  to the right of   12
19    7  to the right of    4
20    7  to the right of    2
21    8  to the right of   17
22    8  to the right of    5
23    8  to the right of   11
24    8  to the right of    0
25    8  to the right of    6
26    8  to the right of    3
27    9  to the right of   17
28    9  to the right of    6
29   10   to the left of    6
30   10   to the left of   17
31   10   to the left of    0
32   10   to the left of    3
33   10               on   13
34   11  to the right of   15
35   11   to the left of    8
36   11         covering    5
37   11  to the right of   13
38   12               on    2
39   12   to the left of    7
40   13   to the left of    0
41   13   to the left of   11
42   13   to the left of   17
43   13   to the left of    5
44   13   to the left of    6
45   13   to the left of    3
46   14          holding    2
47   14             with   17
48   14          wearing   16
49   14          wearing   11
50   14           eating    2
51   15   to the left of    5
52   15               on   13
53   15   to the left of   11
54   17   to the left of    9
55   17   to the left of    8
56   17  to the right of   13
57   17  to the right of   10