Does the vehicle made of metal look gray?
Yes, the car is gray.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   11
2     1   to the left of    6
3     1   to the left of    9
4     1   to the left of   14
5     2   to the left of    4
6     3          wearing   10
7     3   to the left of    6
8     3   to the left of   14
9     3   to the left of   15
10    3          holding   15
11    4  to the right of    6
12    4  to the right of    0
13    4  to the right of    2
14    4  to the right of    9
15    4  to the right of   14
16    4  to the right of   13
17    5               of    8
18    5   to the left of   11
19    6  to the right of    1
20    6  to the right of    3
21    6   to the left of    7
22    6   to the left of    4
23    6  to the right of   14
24    7  to the right of   14
25    7  to the right of    9
26    7  to the right of   13
27    7   to the left of   11
28    7  to the right of    6
29    8  to the right of   14
30    8   to the left of   11
31    9   to the left of    7
32    9  to the right of   14
33    9  to the right of    1
34    9   to the left of    4
35   10   to the left of   15
36   11  to the right of    7
37   11  to the right of    0
38   11  to the right of    5
39   11  to the right of    8
40   12   to the left of   13
41   13  to the right of   12
42   13   to the left of    4
43   13   to the left of    7
44   14  to the right of    1
45   14  to the right of    3
46   14   to the left of    8
47   14   to the left of    4
48   14   to the left of    9
49   14   to the left of    6
50   14   to the left of    7
51   15  to the right of    3
52   15  to the right of   10