| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj -er] period of | 85 |
|
| 2 | [adv] [adj -er] period | 44 |
|
| 3 | [adv] [adj -er] of | 23 |
|
| 4 | [adv] period of | 6 |
|
