| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be only about 20 | 5 |
|
| 2 | [be] only about 20 | 5 |
|
| 3 | only about 20 per | 8 |
|
| 4 | only about 20 [unc] | 8 |
|
| 5 | only about 20 per | 8 |
|
| 6 | only about 20 [no cls] | 8 |
|
| 7 | only about 20 [noun] | 7 |
|
