| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a 50 per | 23 |
|
| 2 | [prep] the 50 per | 13 |
|
| 3 | of [art] 50 per | 9 |
|
| 4 | for [art] 50 per | 9 |
|
| 5 | with [art] 50 per | 5 |
|
