Which shape is this plate?
The plate is rectangular.
    src        edge_attr  dst
0     0   to the left of    4
1     2               on    4
2     2  to the right of    5
3     2  to the right of    6
4     2   to the left of    3
5     2   to the left of   12
6     2   to the left of    9
7     3  to the right of    2
8     4  to the right of    5
9     4  to the right of    6
10    4  to the right of    0
11    5               on    6
12    5   to the left of    7
13    5   to the left of    4
14    5   to the left of    2
15    6   to the left of    4
16    6   to the left of    2
17    7  to the right of    5
18    9               on    4
19    9  to the right of    2
20    9   to the left of   12
21   11   to the left of   13
22   11   to the left of   14
23   12               on    4
24   12  to the right of    9
25   12  to the right of    2
26   13  to the right of   11
27   14  to the right of   11