| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] for [det] purpose | 14 |
|
| 2 | been [verb] for [det] purpose | 13 |
|
| 3 | been [verb] for this purpose | 7 |
|
| 4 | been used for [det] purpose | 6 |
|
| 5 | been [verb] for that purpose | 6 |
|
| 6 | been use for [det] purpose | 6 |
|
