| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is required [prep] [art] | 20 |
|
| 2 | what [is] required [prep] [art] | 20 |
|
| 3 | what [is] required [prep] the | 14 |
|
| 4 | what [is] required of [art] | 6 |
|
| 5 | what [is] required [prep] a | 5 |
|
