| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] than half a [noun] | 132 |
|
| 2 | [det] than half [art] century | 26 |
|
| 3 | [det] [conj] half a century | 25 |
|
| 4 | [det] [subord] half a century | 25 |
|
| 5 | [adj] than half a century | 25 |
|
| 6 | [det] than half a century | 25 |
|
| 7 | [det] than [adj] a century | 25 |
|
