| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a fixed period | 26 |
|
| 2 | [noun sg] [prep] a fixed period | 20 |
|
| 3 | [verb] [prep] a fixed period | 10 |
|
| 4 | [vb pp] [prep] a fixed period | 7 |
|
| 5 | [prep] a fixed period [prep] | 29 |
|
| 6 | [prep] a fixed period [prep] | 29 |
|
| 7 | [prep] a fixed period of | 25 |
|
| 8 | [prep] a fixed period of | 25 |
|
