| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a period [prep] [art] [noun] | 75 |
|
| 2 | a period [prep] [det] [noun] | 48 |
|
| 3 | period [prep] [art] [det] [noun] | 22 |
|
| 4 | a period [prep] [art] [det] | 14 |
|
