| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] [noun] for a period | 9 |
|
| 2 | [num] for a period [prep] | 6 |
|
| 3 | [num] for a period of | 6 |
|
| 4 | [num] for a period [prep] | 6 |
|
| 5 | [num] for a period of | 6 |
|
