What is in front of the mountain?
The train is in front of the mountain.
    src        edge_attr  dst
0     0  on the front of    3
1     0  to the right of    1
2     1        on top of    3
3     1   to the left of    0
4     2           beside    3
5     3          pulling    4
6     3      in front of    7
7     3      in front of    8
8     3            below    5
9     4               of    3
10    4        pulled by    3
11    5            above    3
12    5  to the right of    7
13    7   to the left of    5
14    8           behind    3