| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | are [vb pp] for [det] purpose | 9 |
|
| 2 | are [vb pp] for this purpose | 8 |
|
| 3 | are [vb pp] for this purpose | 8 |
|
| 4 | are used for [adj] purpose | 5 |
|
