| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 20 per | 398 |
|
| 2 | on [num] per | 83 |
|
| 3 | on [adj] per | 83 |
|
| 4 | on 20 per | 5 |
|
| 5 | on 20 [no cls] | 5 |
|
| 6 | on 20 per | 5 |
|
| 7 | on 20 [unc] | 5 |
|
