| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 20 per | 398 |
|
| 2 | [prep] [art] 20 | 295 |
|
| 3 | [art] 20 per | 164 |
|
| 4 | [prep] [art] per | 43 |
|
