| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can be obtain [prep] | 587 |
|
| 2 | be obtain [prep] [art] | 394 |
|
| 3 | can be [prep] [art] | 159 |
|
| 4 | can obtain [prep] [art] | 10 |
|
