| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] for [adj] purpose | 16 |
|
| 2 | [is] [vb pp] for [det] purpose | 14 |
|
| 3 | [is] [vb pp] for this purpose | 12 |
|
| 4 | [is] [vb pp] for this purpose | 12 |
|
| 5 | [is] used for [adj] purpose | 6 |
|
