| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] of about 20 per | 5 |
|
| 2 | of about 20 per [no cls] | 5 |
|
| 3 | of about 20 per cent | 5 |
|
| 4 | of about 20 per [unc] | 5 |
|
| 5 | of about 20 per cent | 5 |
|
