| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] [det] than a | 7 |
|
| 2 | period of [det] than [art] | 7 |
|
| 3 | period of [det] than [art] | 7 |
|
| 4 | period [prep] [det] than [art] | 7 |
|
| 5 | period [prep] [det] than [art] | 5 |
|
