| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what it is for | 12 |
|
| 2 | [prep] what it is for | 12 |
|
| 3 | [prep] what it is for | 12 |
|
| 4 | of what it is for | 10 |
|
| 5 | of what it is for | 10 |
|
