| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] months at [art] time | 16 |
|
| 2 | [prep] months at a time | 16 |
|
| 3 | [prep] months at a time | 16 |
|
| 4 | for months at [art] time | 16 |
|
| 5 | [prep] months at [art] time | 16 |
|
