| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] months [conj] | 667 |
|
| 2 | [prep] 18 [noun] [conj] | 116 |
|
| 3 | [prep] 18 [noun pl] [conj] | 96 |
|
| 4 | [prep] 18 month [conj] | 44 |
|
