What is on the deck?
The fence is on the deck.
   src        edge_attr  dst
0    0   to the left of   12
1    3  to the right of   10
2    5   to the left of   12
3    8   to the left of   12
4    9               on    4
5   10   to the left of    3
6   12  to the right of    0
7   12  to the right of    8
8   12  to the right of    5