| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | take at [adv] [num] years | 24 |
|
| 2 | take at least [adj] years | 24 |
|
| 3 | take at [adv] [adj] years | 14 |
|
| 4 | take at [adv] two years | 5 |
|
| 5 | take at [adv] two years | 5 |
|
