| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that be required for | 20 |
|
| 2 | that [is] required for | 12 |
|
| 3 | that is required for | 12 |
|
| 4 | that [am/are] required for | 7 |
|
| 5 | that are required for | 7 |
|
