| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [prep] six months | 34 |
|
| 2 | [noun prp] for six months | 22 |
|
| 3 | [noun prp] for six months | 22 |
|
| 4 | [noun prp] within six months | 5 |
|
| 5 | [noun prp] within six months | 5 |
|
