| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adv] twenty years | 26 |
|
| 2 | [adv] [adv] twenty years | 15 |
|
| 3 | [adv] over twenty years | 13 |
|
| 4 | [adv prt] [adv] twenty years | 9 |
|
