| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] per | 495 |
|
| 2 | on [art] [num] per | 41 |
|
| 3 | on [art] [num] per | 41 |
|
| 4 | on a [num] per | 27 |
|
| 5 | on a [num] [unc] | 26 |
|
| 6 | on a [adj] per | 25 |
|
