| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] for a period [prep] | 26 |
|
| 2 | [adv] for a period [prep] | 26 |
|
| 3 | [adv] for a period of | 23 |
|
| 4 | [adv] for a period of | 23 |
|
| 5 | [adv] for a period [prep] | 19 |
|
| 6 | [adv prt] for a period [prep] | 7 |
|
