| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [num] years | 7381 |
|
| 2 | for [num] years | 6137 |
|
| 3 | [adv] for [num] | 2561 |
|
| 4 | [adv] for years | 255 |
|
