What is the sheet inside of?
The sheet is inside the box.
    src        edge_attr  dst
0     0             near    4
1     0   to the left of   11
2     0               on    8
3     0   to the left of    4
4     0          next to    4
5     1  to the right of    5
6     2               on    8
7     2  to the right of    4
8     2           behind    7
9     2  to the right of    7
10    3               on    8
11    3   to the left of    7
12    4             near    0
13    4               on    8
14    4  to the right of    0
15    4   to the left of    2
16    4  to the right of    6
17    5  to the right of    6
18    5   to the left of    1
19    6   to the left of    5
20    6   to the left of    4
21    7           beside    4
22    7   to the left of    2
23    7               on    8
24    7  to the right of    3
25    7      in front of    2
26   10           inside    3
27   11  to the right of    0
28   11               on    8