| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] time | 337 |
|
| 2 | a [adv] [adj] period [prep] | 121 |
|
| 3 | [adv] [adj] period [prep] time | 65 |
|
| 4 | a [adv] [adj] [prep] time | 12 |
|
