| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an agreed period [prep] | 5 |
|
| 2 | [prep] an agreed period [prep] | 5 |
|
| 3 | an agreed period [prep] [noun] | 5 |
|
| 4 | an agreed period [prep] [noun sg] | 5 |
|
