| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] three months [prep] [noun prp] | 16 |
|
| 2 | [prep] three months [prep] [noun prp] | 16 |
|
| 3 | [prep] three months at [noun prp] | 6 |
|
| 4 | [prep] three months at [noun prp] | 6 |
|
