| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [prep] [det] [noun] | 83 |
|
| 2 | has been established [prep] [noun] | 42 |
|
| 3 | been established [prep] [det] [noun] | 20 |
|
| 4 | has been established [prep] [det] | 10 |
|
