| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a [adv] long period [prep] | 7 |
|
| 2 | for a [adv] long period [prep] | 7 |
|
| 3 | for [art] [adv] long period [prep] | 7 |
|
| 4 | for [art] [adv] long period [prep] | 7 |
|
| 5 | for [art] [adv] long period of | 6 |
|
| 6 | for [art] [adv] long period [prep] | 5 |
|
