| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] period [prep] | 849 |
|
| 2 | [prep] long period [prep] | 175 |
|
| 3 | [adj] long period [prep] | 14 |
|
| 4 | [prep] [adj] long period | 11 |
|
| 5 | [prep] [adj] long [prep] | 7 |
|
