| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] | 1333 |
|
| 2 | a fixed [noun] [prep] | 345 |
|
| 3 | a fixed [noun sg] [prep] | 345 |
|
| 4 | [art] fixed period [prep] | 34 |
|
| 5 | a fixed period [prep] | 33 |
|
