| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [verb] for [adj] purpose | 8 |
|
| 2 | has been [vb pp] for [adj] purpose | 8 |
|
| 3 | has been [verb] for [adj] purposes | 5 |
|
| 4 | has been [verb] for [adj] purpose | 5 |
|
