What do the books lie on?
The books lie on the couch.
    src        edge_attr  dst
0     0         lying on    5
1     0  to the right of    6
2     0  to the right of    4
3     1   to the left of    6
4     1   to the left of    5
5     1   to the left of    4
6     2   to the left of    4
7     2   to the left of    6
8     2               on    1
9     2   to the left of    5
10    3               on    4
11    4   to the left of    5
12    4  to the right of    2
13    4   to the left of    6
14    4  to the right of    1
15    4   to the left of    0
16    5  to the right of    1
17    5  to the right of    4
18    5  to the right of    2
19    6               on    5
20    6  to the right of    2
21    6   to the left of    0
22    6  to the right of    1
23    6  to the right of    4