What is in front of the door?
The ladder is in front of the door.
    src        edge_attr  dst
0     2   to the left of    4
1     3             near    7
2     4  to the right of    2
3     4             near   11
4     4  to the right of   10
5     4  to the right of    8
6     5               of   11
7     5   to the left of    6
8     5           beside    3
9     5   to the left of    7
10    6           behind    7
11    6  to the right of    5
12    7      in front of    6
13    7             near    3
14    7  to the right of    5
15    7             near   11
16    8       sitting on   11
17    8   to the left of    4
18    8        on top of   11
19    8          holding   10
20    8          wearing    2
21   10   to the left of    4
22   11             near    7
23   11             near    4