| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a certain number [prep] [noun] [art] | 5 |
|
| 2 | a certain number of [noun] [art] | 5 |
|
| 3 | a certain number of [noun] [art] | 5 |
|
| 4 | a certain number [prep] [noun pl] [art] | 5 |
|
| 5 | a certain number [prep] [noun] [art] | 5 |
|
| 6 | a certain number [prep] [noun] [art] | 5 |
|
