Are there any carts to the left of the lock?
Yes, there is a cart to the left of the lock.
    src        edge_attr  dst
0     0  to the right of    2
1     0   to the left of    6
2     0   to the left of    3
3     1   to the left of    8
4     2   to the left of    5
5     2   to the left of    9
6     2   to the left of    0
7     3   to the left of    8
8     3  to the right of   10
9     3  to the right of    5
10    3  to the right of    0
11    5   to the left of    3
12    5   to the left of    6
13    5  to the right of    2
14    6  to the right of    0
15    6  to the right of    5
16    8  to the right of    1
17    8  to the right of    3
18    9  to the right of    2
19   10   to the left of    3
20   10               by    9