| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [prep] [art] long period of | 5 |
|
| 2 | [conj] [prep] [art] long period of | 5 |
|
| 3 | [conj] [art] long period of [noun] | 6 |
|
| 4 | [conj] [art] long period of [noun sg] | 6 |
|
