Which color is the car that is parked on the street?
The car is silver.
    src        edge_attr  dst
0     0   on the side of    8
1     1   to the left of    3
2     2   to the left of   17
3     2  to the right of   14
4     2  to the right of   19
5     3  to the right of    1
6     4     driving down    5
7     4       driving on    5
8     4  to the right of   19
9     4       going down    5
10    4   to the left of   17
11    4  to the right of   14
12    6  to the right of   14
13    6  to the right of   19
14    6   to the left of   17
15    7   to the left of   19
16    7   to the left of   14
17    8  to the right of    9
18    8  to the right of   18
19    8  to the right of   15
20    8   to the left of   13
21    8   to the left of   12
22    9  to the right of   18
23    9  to the right of   15
24    9  to the right of   14
25    9   to the left of    8
26   10  on the front of    8
27   11  to the right of   14
28   11   to the left of   17
29   11  to the right of   19
30   12            above   13
31   12  to the right of    8
32   13  to the right of    8
33   13            below   12
34   14   to the left of    9
35   14   to the left of   11
36   14   to the left of   18
37   14   to the left of   15
38   14   to the left of    4
39   14   to the left of    6
40   14  to the right of    7
41   14   to the left of    2
42   15  to the right of   14
43   15   to the left of    9
44   15   to the left of    8
45   15      in front of   18
46   17        parked on    5
47   17  to the right of    6
48   17  to the right of    4
49   17  to the right of   11
50   17  to the right of    2
51   18   to the left of    8
52   18   to the left of    9
53   18           behind   15
54   18  to the right of   14
55   19   to the left of   11
56   19   to the left of    4
57   19   to the left of    6
58   19  to the right of    7
59   19   to the left of    2