| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] [art] long period | 10 |
|
| 2 | [prep] [adj] a long period | 10 |
|
| 3 | [prep] [adj] a long period | 10 |
|
| 4 | [prep] [adj] [art] long period | 10 |
|
