| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] [num ord] [adj] months | 431 |
|
| 2 | [prep] [art] [num ord] eighteen months | 50 |
|
| 3 | over [art] [adj] eighteen months | 22 |
|
| 4 | over [art] [num ord] eighteen [noun pl] | 15 |
|
| 5 | over [art] [num ord] eighteen [noun] | 15 |
|
| 6 | over [art] [num ord] eighteen month | 14 |
|
| 7 | over [art] [num ord] eighteen months | 14 |
|
