Is the polar bear in front of the tree?
Yes, the polar bear is in front of the tree.
    src        edge_attr  dst
0     0  to the right of    1
1     1  to the right of    2
2     1      in front of    2
3     1      in front of    8
4     1   to the left of    0
5     2           behind    1
6     2   to the left of    1
7     4               on    3
8     5   to the left of    6
9     6  to the right of    5
10    8           behind    1
11   11               by    4