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