| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the period [prep] | 1401 |
|
| 2 | [prep] long period [prep] | 175 |
|
| 3 | the long period [prep] | 58 |
|
| 4 | [prep] the long period | 35 |
|
| 5 | [prep] the long [prep] | 9 |
|
