What is the computer mouse on?
The mouse is on the desk.
    src        edge_attr  dst
0     0  to the right of    3
1     1  to the right of    5
2     2  to the right of   10
3     3   to the left of   13
4     3  to the right of    4
5     3   to the left of    0
6     4   to the left of    3
7     5  to the right of    9
8     5   to the left of    1
9     5               on   11
10    8  to the right of    9
11    9   to the left of    5
12    9   to the left of    8
13   10               on    6
14   10   to the left of    2
15   11            above   12
16   12            under   11
17   13       sitting on   11
18   13  to the right of    3