| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | on [prep] a long [noun] | 53 |
|
| 2 | [adv] [prep] a long period | 36 |
|
| 3 | on [prep] a [adj] period | 10 |
|
| 4 | on [prep] [art] long period | 5 |
|
| 5 | on [prep] a long period | 5 |
|
| 6 | on [prep] a long period | 5 |
|
| 7 | on [prep] [art] long period | 5 |
|
