How old is this man?
The man is old.
    src        edge_attr  dst
0     3   to the left of    9
1     3   to the left of    7
2     3   to the left of   11
3     4   to the left of    7
4     6   to the left of   15
5     6   to the left of   12
6     7  to the right of    4
7     7  to the right of    3
8     7               of    6
9     7   to the left of   12
10    9  to the right of    3
11   11   to the left of   12
12   11  to the right of    3
13   12  to the right of    7
14   12  to the right of    6
15   12  to the right of   11
16   15  to the right of    6