| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [adv] [adj -er] period of | 10 |
|
| 2 | [art] [adv] [adj -er] period of | 10 |
|
| 3 | a [adv] [adj -er] period of | 9 |
|
| 4 | a [adv] [adj -er] period of | 8 |
|
| 5 | [adv] [adj -er] period of time | 5 |
|
| 6 | [adv] [adj -er] period of time | 5 |
|
| 7 | [adv] [adj -er] period of [noun] | 5 |
|
| 8 | [adv] [adj -er] period of [noun sg] | 5 |
|
