| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [adv] [prep] [det] purpose | 8 |
|
| 2 | been [vb pp] [adv] [prep] [det] purpose | 5 |
|
| 3 | [verb] been [vb pp] [prep] [det] purpose | 10 |
|
| 4 | have been [vb pp] [prep] [det] purpose | 10 |
|
