| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to have [been] written [prep] | 22 |
|
| 2 | [to-vb] been written [prep] | 22 |
|
| 3 | [to-vb] [been] written by | 9 |
|
| 4 | [to-vb] [been] written in | 5 |
|
