| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for long period [prep] | 121 |
|
| 2 | [adv] long period [prep] | 56 |
|
| 3 | for [adv] long period | 36 |
|
| 4 | for [adv] long [prep] | 7 |
|
