| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adv] long period | 23 |
|
| 2 | [prep] a [adv] long period | 23 |
|
| 3 | for a [adv] long period | 11 |
|
| 4 | for a [adv] long period | 11 |
|
| 5 | over a [adv] long period | 10 |
|
| 6 | over a [adv] long period | 10 |
|
| 7 | a [adv] long [noun sg] period | 5 |
|
| 8 | a [adv] long [noun] period | 5 |
|
| 9 | a [adv] long period [prep] | 14 |
|
| 10 | a [adv] long period [prep] | 14 |
|
| 11 | a [adv] long period of | 12 |
|
| 12 | a [adv] long period of | 12 |
|
