| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] fixed period [prep] | 34 |
|
| 2 | [art] fixed period [prep] | 34 |
|
| 3 | a fixed period [prep] | 33 |
|
| 4 | [art] fixed period of | 28 |
|
| 5 | [art] fixed period of | 28 |
|
