What is located on top of the counter?
The book is on top of the counter.
    src          edge_attr  dst
0     1          on top of    4
1     1  sitting on top of    4
2     1     to the left of    4
3     1    to the right of    3
4     2     to the left of    4
5     2          on top of    1
6     3     to the left of    6
7     3     to the left of    1
8     4    to the right of    2
9     4    to the right of    1
10    5    to the right of    6
11    6    to the right of    3
12    6     to the left of    5
13    6     to the left of    7
14    7    to the right of    6
15    7                 by    0