| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [adv] long period of | 23 |
|
| 2 | [art] [adv] long period [prep] | 20 |
|
| 3 | a [adv] long period [prep] | 19 |
|
| 4 | [art] very long period [prep] | 9 |
|
| 5 | the [adv] long period [prep] | 5 |
|
| 6 | [art] relatively long period [prep] | 5 |
|
| 7 | [art] [adv] longer period [prep] | 5 |
|
