What is under the clock?
The windows are under the clock.
    src        edge_attr  dst
0     0               of    6
1     0   to the left of    9
2     1            under    6
3     1   to the left of    8
4     4  to the right of    8
5     4   to the left of    7
6     5  to the right of    7
7     6            above    8
8     6            above    1
9     6   to the left of    9
10    7  to the right of    8
11    7  to the right of    4
12    7   to the left of    5
13    7               by    4
14    8            under    6
15    8   to the left of    4
16    8  to the right of    1
17    8   to the left of    7
18    9  to the right of    6
19    9  to the right of    0