What is underneath the cat?
The pen is underneath the cat.
    src        edge_attr  dst
0     0       underneath    2
1     0            below    2
2     0            under    2
3     1   to the left of    5
4     1   to the left of   12
5     1   to the left of   10
6     2   to the left of    4
7     2   to the left of    3
8     2   to the left of    7
9     2            above    0
10    2   to the left of   11
11    3        on top of    4
12    3       sitting on    4
13    3               on    4
14    3  to the right of   10
15    3  to the right of    2
16    3  to the right of   12
17    4  to the right of   13
18    4  to the right of    2
19    4  to the right of    5
20    4  to the right of   12
21    4  to the right of   10
22    5  to the right of    1
23    5   to the left of    4
24    5   to the left of    9
25    5               of    2
26    7  to the right of    2
27    7  to the right of   12
28    9  to the right of    5
29    9               of    2
30   10  to the right of    1
31   10   to the left of    4
32   10               of    2
33   10   to the left of    3
34   11  to the right of    2
35   12   to the left of    4
36   12  to the right of    1
37   12   to the left of    7
38   12   to the left of    3
39   12               of    2
40   13   to the left of    4