| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [prep] [art] long period of | 12 |
|
| 2 | [noun pl] [prep] [art] long period of | 12 |
|
| 3 | [noun pl] [prep] a long period of | 11 |
|
| 4 | [noun pl] [prep] [art] long period of | 11 |
|
| 5 | [noun pl] [prep] a long period of | 11 |
|
| 6 | [noun pl] over [art] long period of | 8 |
|
| 7 | [noun pl] over [art] long period of | 8 |
|
