| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period | 177 |
|
| 2 | [noun] [prep] a long [conj] | 56 |
|
| 3 | [prep] a long period [conj] | 28 |
|
| 4 | [noun] [prep] a period [conj] | 21 |
|
