| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] for the last 18 | 5 |
|
| 2 | for the last 18 [noun pl] | 15 |
|
| 3 | for the last 18 [noun] | 15 |
|
| 4 | for the last 18 month | 11 |
|
| 5 | for the last 18 months | 11 |
|
