| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | long period [prep] | 637 |
|
| 2 | long period [prep] | 637 |
|
| 3 | long [noun] for | 291 |
|
| 4 | [adj] period for | 168 |
|
| 5 | long period for | 6 |
|
