| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj -er] period [prep] time | 15 |
|
| 2 | [prep] a [adj -er] period [prep] time | 15 |
|
| 3 | over a [adj -er] period [prep] time | 7 |
|
| 4 | over a [adj -er] period [prep] time | 7 |
|
| 5 | for a [adj -er] period [prep] time | 5 |
|
| 6 | for a [adj -er] period [prep] time | 5 |
|
| 7 | a [adv] [adj -er] period [prep] time | 5 |
|
| 8 | a much [adj -er] period [prep] time | 5 |
|
| 9 | a [adv] [adj -er] period [prep] time | 5 |
|
| 10 | a much [adj -er] period [prep] time | 5 |
|
