What type of furniture is the clock on?
The clock is on the desk.
    src        edge_attr  dst
0     0   to the left of    1
1     0  to the right of    7
2     1               on    3
3     1  to the right of    0
4     2  to the right of    6
5     2  to the right of    8
6     2   to the left of    4
7     4  to the right of    2
8     5  to the right of    8
9     6   to the left of    2
10    6               on    3
11    7   to the left of    0
12    7   to the left of    8
13    8   to the left of    2
14    8   to the left of    5
15    8  to the right of    7
16    8               on    3