| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | required [to-vb] [prep] [adj] [noun sg] | 34 |
|
| 2 | required [to-vb] [prep] [det] [noun sg] | 15 |
|
| 3 | required [to-vb] [prep] [adj] [noun sg] | 15 |
|
| 4 | required [to-vb] in [adj] [noun sg] | 11 |
|
| 5 | required [to-vb] in [adj] [noun sg] | 11 |
|
