| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a long [noun] [prep] | 168 |
|
| 2 | [adv] a [adj] period [prep] | 53 |
|
| 3 | [adv] [art] long period [prep] | 15 |
|
| 4 | [adv] [art] long period [prep] | 15 |
|
| 5 | [adv] a long period [prep] | 13 |
|
