| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [prep] [det] purpose | 74 |
|
| 2 | used [prep] the [det] | 68 |
|
| 3 | [prep] the [det] purpose | 53 |
|
| 4 | used [prep] the purpose | 19 |
|
