| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for [prep] [adv] a | 179 |
|
| 2 | [prep] [adv] a decade | 63 |
|
| 3 | for [prep] a decade | 35 |
|
| 4 | for [adv] a decade | 26 |
|
