| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | than half a [noun] [adv] | 30 |
|
| 2 | [conj] half a century [adv] | 10 |
|
| 3 | [subord] half a century [adv] | 7 |
|
| 4 | than half [art] century [adv] | 7 |
|
| 5 | than [adj] a century [adv] | 7 |
|
| 6 | than half a century [adv] | 7 |
|
| 7 | than half a century [adv] | 7 |
|
