| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long [noun] | 1331 |
|
| 2 | [noun] [prep] a [adj] period | 766 |
|
| 3 | [noun] [prep] [art] long period | 189 |
|
| 4 | [noun] [prep] [art] long period | 189 |
|
| 5 | [noun] [prep] a long period | 177 |
|
| 6 | [noun] [prep] a long period | 177 |
|
