| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] be establish for [det] | 6 |
|
| 2 | [vb -s] be established for [det] | 6 |
|
| 3 | [vb -s] been establish for [det] | 6 |
|
| 4 | has be establish for [det] | 5 |
|
