Is the train made of metal brown or silver?
The train is silver.
    src        edge_attr  dst
0     0  to the right of   11
1     0  to the right of    4
2     0  to the right of    9
3     0               of    5
4     0  to the right of    3
5     1   to the left of   10
6     2  to the right of    9
7     3   to the left of    0
8     3  to the right of    9
9     3  to the right of   11
10    4  to the right of   11
11    4   to the left of    0
12    4  to the right of    9
13    4  to the right of    8
14    6  to the right of    9
15    6  to the right of    7
16    7   to the left of    6
17    7               of    5
18    8               on    9
19    8               on   11
20    8   to the left of    4
21    9   to the left of    0
22    9   to the left of    2
23    9   to the left of    3
24    9   to the left of    4
25    9   to the left of    6
26   10  to the right of    1
27   11   to the left of    3
28   11   to the left of    4
29   11   to the left of    0