Where is the gas pump?
The gas pump is at the gas station.
    src        edge_attr  dst
0     0   to the left of   13
1     1            above   14
2     2   to the left of   13
3     3               by    1
4     3          wearing    0
5     3   to the left of   13
6     3          wearing    2
7     5   to the left of   13
8     7               on    4
9     9   to the left of   13
10   10   to the left of   12
11   10               on   13
12   12               on   13
13   12  to the right of   10
14   13               at    6
15   13  to the right of    2
16   13  to the right of    5
17   13  to the right of    0
18   13  to the right of    9
19   13  to the right of    3
20   14            below    1