| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] months ' [noun sg] | 414 |
|
| 2 | 18 [noun pl] ' [noun sg] | 31 |
|
| 3 | 18 [noun] ' [noun sg] | 31 |
|
| 4 | 18 month ' [noun sg] | 25 |
|
| 5 | 18 months ' [noun] | 25 |
|
| 6 | 18 months [unc] [noun sg] | 25 |
|
