Is there a empty chair or cup?
Yes, there is an empty cup.
    src        edge_attr  dst
0     1   to the left of   10
1     1   to the left of    5
2     1   to the left of    2
3     2  to the right of    1
4     2  to the right of    5
5     2  to the right of    4
6     2   to the left of   10
7     2  to the right of    9
8     3  to the right of    9
9     3  to the right of    5
10    3   to the left of   10
11    4   to the left of    2
12    4   to the left of   10
13    4   to the left of    5
14    5  to the right of    9
15    5   to the left of   10
16    5   to the left of    2
17    5  to the right of    1
18    5  to the right of    4
19    5   to the left of    3
20    6               in    5
21    9   to the left of    2
22    9   to the left of    3
23    9   to the left of    5
24    9   to the left of   10
25   10  to the right of    1
26   10  to the right of    2
27   10  to the right of    9
28   10  to the right of    5
29   10  to the right of    4
30   10  to the right of    3