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