| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [vb pp] [prep] this study | 12 |
|
| 2 | [subord] [vb pp] [prep] this study | 12 |
|
| 3 | as [vb pp] [prep] this study | 12 |
|
| 4 | [subord] [vb pp] in this study | 9 |
|
