| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [adv] long period | 20 |
|
| 2 | [noun sg] [prep] a [adv] long period | 15 |
|
| 3 | [conj] [prep] a [adv] long period | 7 |
|
| 4 | [verb] [prep] a [adv] long period | 5 |
|
| 5 | [adv] [prep] a [adv] long period | 5 |
|
| 6 | [prep] a [adv] long period [prep] | 13 |
|
| 7 | [prep] a [adv] long period [prep] | 13 |
|
| 8 | [prep] a [adv] long period of | 12 |
|
| 9 | [prep] a [adv] long period of | 12 |
|
| 10 | [prep] a [adv] long period [conj] | 6 |
|
