What is the basket full of?
The basket is full of tennis balls.
    src        edge_attr  dst
0     1   to the left of    5
1     1   to the left of   18
2     4        on top of    3
3     5  to the right of    1
4     5   to the left of   10
5     5  to the right of   18
6     6   to the left of   16
7     6  to the right of    9
8     6  to the right of   20
9     9   to the left of    6
10   10  to the right of    5
11   10  to the right of   18
12   13   to the left of   19
13   16  to the right of    6
14   16  to the right of   19
15   18   to the left of    5
16   18  to the right of    1
17   18   to the left of   10
18   19   to the left of   16
19   19  to the right of   13
20   20   to the left of    6
21   22          full of    0
22   22               of    0