| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period [prep] time | 30 |
|
| 2 | [adv] a [adj] period [prep] time | 30 |
|
| 3 | [adv] a long period [prep] [noun] | 12 |
|
| 4 | [adv] a long period [prep] time | 11 |
|
| 5 | [adv] a long [noun sg] [prep] time | 11 |
|
| 6 | [adv] a long period [prep] time | 11 |
|
| 7 | [adv] a long period [prep] time | 11 |
|
| 8 | [adv] [art] long period [prep] time | 11 |
|
| 9 | [adv] a long [noun] [prep] time | 11 |
|
