| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] months | 416 |
|
| 2 | [prep] a three [noun] | 236 |
|
| 3 | [prep] [art] three months | 119 |
|
| 4 | [prep] [art] three months | 119 |
|
| 5 | [prep] a three month | 29 |
|
| 6 | [prep] a three [noun pl] | 10 |
|
| 7 | [prep] a three months | 7 |
|
