What's on the tower?
The clock is on the tower.
    src        edge_attr  dst
0     0  to the right of    1
1     1   to the left of    0
2     2               of    5
3     3               on    5
4     3  to the right of    4
5     4   to the left of    3
6     4               on    5
7     5             near    8
8     5               by    6
9     5             near    6
10    5             with    4
11    5             near   10
12    5      in front of   10
13    5  to the right of   10
14    6             near    5
15    6             near   10
16    6             near    7
17    6             near    8
18    7             near    6
19    8               in    6
20    8             near    5
21    8             near    6
22    8  to the right of   10
23    8               by    5
24   10             near    5
25   10           behind    5
26   10             near    6
27   10   to the left of    8
28   10   to the left of    5