| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] use [prep] [adj] studies | 6 |
|
| 2 | been use [prep] [adj] study | 6 |
|
| 3 | [been] used [prep] [adj] study | 6 |
|
| 4 | [been] use in [adj] study | 5 |
|
