Who is on the bench that is sitting?
The couple is on the bench.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of    4
2     1   to the left of   19
3     1   to the left of    2
4     1   to the left of    9
5     2   to the left of    9
6     2   to the left of   19
7     2  to the right of    1
8     3       sitting on   17
9     3   to the left of    9
10    3   to the left of    7
11    3   to the left of   19
12    4  to the right of    0
13    4   to the left of   16
14    4  to the right of   10
15    4  to the right of   19
16    5   to the left of   19
17    7  to the right of    3
18    7   to the left of   19
19    8  to the right of   19
20    8  to the right of   10
21    8   to the left of   16
22    9  to the right of   11
23    9  to the right of    2
24    9  to the right of    1
25    9  to the right of    3
26    9   to the left of   19
27   10   to the left of    4
28   10   to the left of    8
29   11   to the left of   19
30   11   to the left of    9
31   12  to the right of   19
32   13  to the right of    0
33   13   to the left of   16
34   14   to the left of   19
35   16  to the right of    8
36   16  to the right of    4
37   16  to the right of   19
38   16  to the right of   13
39   17   to the left of   19
40   18               on   17
41   18   to the left of   19
42   19  to the right of    3
43   19   to the left of    4
44   19  to the right of    2
45   19  to the right of    9
46   19   to the left of    8
47   19  to the right of    1
48   19  to the right of    5
49   19  to the right of   14
50   19   to the left of   16
51   19  to the right of   17
52   19  to the right of   18
53   19   to the left of   12
54   19               in    6
55   19  to the right of   11
56   19  to the right of    7