| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a century | 212 |
|
| 2 | [prep] over a century | 61 |
|
| 3 | [noun sg] [prep] over a | 48 |
|
| 4 | [noun sg] over a century | 5 |
|
