| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [prep] [noun sg] | 20440 |
|
| 2 | required [prep] [noun sg] | 709 |
|
| 3 | required [to-vb] [prep] | 442 |
|
| 4 | required [to-vb] [noun sg] | 278 |
|
