What is the pen on?
The pen is on the table.
    src        edge_attr  dst
0     0          wearing    5
1     0             near   11
2     0          next to   11
3     0   to the left of    7
4     0  to the right of    6
5     0   to the left of   14
6     1   to the left of    5
7     1               on    3
8     1  to the right of   10
9     1  to the right of    4
10    2  to the right of    4
11    4   to the left of    2
12    4   to the left of    1
13    5  to the right of   10
14    5  to the right of    1
15    6   to the left of    0
16    7  to the right of    0
17    9  to the right of   11
18   10               on    3
19   10   to the left of    5
20   10   to the left of    1
21   11   to the left of   12
22   11   to the left of    9
23   11             near    0
24   12  to the right of   11
25   14  to the right of    0