| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adj -er] period | 44 |
|
| 2 | much [adj -er] period | 29 |
|
| 3 | much [adj -er] period | 29 |
|
| 4 | [adv] longer period | 26 |
|
| 5 | [adv] shorter period | 11 |
|
