| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] at | 4833 |
|
| 2 | [vb pp] [to-vb] at | 1030 |
|
| 3 | required [to-vb] [prep] | 442 |
|
| 4 | required [to-vb] [prep] | 442 |
|
| 5 | require [to-vb] at | 33 |
|
| 6 | required [to-vb] at | 29 |
|
| 7 | required [verb] at | 29 |
|
