| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] than half a century | 25 |
|
| 2 | [adj] than half a century | 25 |
|
| 3 | more than half a century | 22 |
|
| 4 | more than half a century | 22 |
|
| 5 | than half a century [adv] | 7 |
|
| 6 | than half a century [adv] | 7 |
|
