| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [prep] least a month [prep] | 6 |
|
| 2 | [prep] [prep] least a month [prep] | 6 |
|
| 3 | for [prep] least a month [prep] | 5 |
|
| 4 | for [prep] least a month [prep] | 5 |
|
| 5 | [prep] [prep] least a month [prep] | 6 |
|
| 6 | [prep] [prep] least a month [prep] | 6 |
|
| 7 | [prep] at least a month [prep] | 6 |
|
| 8 | [prep] at least a month [prep] | 6 |
|
| 9 | [prep] least [adv] a month [prep] | 7 |
|
| 10 | [prep] least [adv] a month [prep] | 7 |
|
| 11 | [prep] least once a month [prep] | 6 |
|
| 12 | [prep] least once a month [prep] | 6 |
|
