Who is younger, the guy or the boy?
The boy is younger than the guy.
    src        edge_attr  dst
0     2   to the left of   13
1     2   to the left of   14
2     4   to the left of   13
3     5   to the left of   13
4     6   to the left of   12
5    10   to the left of   13
6    11   to the left of   13
7    12  to the right of    6
8    12   to the left of   13
9    13  to the right of   11
10   13  to the right of   12
11   13  to the right of    2
12   13  to the right of   10
13   13  to the right of    5
14   13  to the right of    4
15   14  to the right of    2
16   16               in    9