| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | require or [adv] required for | 6 |
|
| 2 | require or [adv] [vb pp] for | 6 |
|
| 3 | require or alternatively [vb pp] for | 6 |
|
| 4 | required or [adv] [vb pp] for | 6 |
|
