| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adv] long [noun] | 337 |
|
| 2 | [prep] a [adv] long [noun sg] | 336 |
|
| 3 | [prep] a [adv] [adj] period | 193 |
|
| 4 | [prep] a [adv] long period | 46 |
|
| 5 | [prep] a [adv] long period | 46 |
|
| 6 | [prep] [art] [adv] long period | 46 |
|
