| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been establish [prep] [det] year | 5 |
|
| 2 | [been] establish [prep] [det] year | 5 |
|
| 3 | [been] established [prep] [det] year | 5 |
|
| 4 | [been] establish [prep] [det] years | 5 |
|
