| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period [coord] | 14 |
|
| 2 | [prep] a long period [coord] | 14 |
|
| 3 | over a long period [coord] | 12 |
|
| 4 | over a long period [coord] | 12 |
|
| 5 | a long period [coord] [pron] | 5 |
|
