What is the color of the bench that is in front of the yard?
The bench is gray.
    src        edge_attr  dst
0     0  to the right of   11
1     0  to the right of    3
2     0   to the left of    2
3     0   to the left of   15
4     0   to the left of    5
5     1               of    6
6     1   to the left of   10
7     1  to the right of    4
8     2  to the right of   11
9     2  to the right of    0
10    2  to the right of    3
11    2   to the left of    5
12    3   to the left of   15
13    3  to the right of   11
14    3   to the left of    0
15    3   to the left of    2
16    3   to the left of    5
17    4   to the left of    1
18    5  to the right of    3
19    5  to the right of    2
20    5  to the right of    0
21    5  to the right of   11
22    7               of    6
23    8  to the right of   15
24    8  to the right of   10
25    8   to the left of   16
26   10   to the left of   16
27   10  to the right of    1
28   10               of    6
29   10   to the left of    8
30   11   to the left of   15
31   11   to the left of    2
32   11   to the left of    0
33   11   to the left of    5
34   11   to the left of    3
35   13           behind   14
36   14               on    9
37   14      in front of   13
38   15   to the left of   16
39   15  to the right of    0
40   15  to the right of   18
41   15  to the right of    3
42   15  to the right of   11
43   15   to the left of   17
44   15   to the left of    8
45   16  to the right of   10
46   16  to the right of   15
47   16  to the right of    8
48   16            above   17
49   17  to the right of   15
50   17            below   16
51   17            under   16
52   18   to the left of   15