| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a [adj] period of | 137 |
|
| 2 | [verb] [prep] a [adj] period of | 129 |
|
| 3 | [verb] [prep] a fixed [noun] of | 38 |
|
| 4 | [verb] [prep] a fixed period [prep] | 6 |
|
| 5 | [verb] [prep] a fixed period [prep] | 6 |
|
| 6 | [verb] [prep] a fixed period of | 6 |
|
| 7 | [verb] [prep] a fixed period of | 6 |
|
| 8 | [verb] [prep] [art] fixed period of | 6 |
|
| 9 | [verb] [prep] [art] fixed period of | 6 |
|
| 10 | [verb] [prep] a fixed period of | 6 |
|
