| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [vb pp] [prep] [art] period of | 20 |
|
| 2 | [noun pl] [vb pp] [prep] [art] period of | 20 |
|
| 3 | [noun pl] [vb pp] [prep] a period of | 12 |
|
| 4 | [noun pl] [vb pp] [prep] a period of | 12 |
|
| 5 | [noun pl] [vb pp] [prep] the period of | 8 |
|
| 6 | [noun pl] [vb pp] [prep] the period of | 8 |
|
| 7 | [noun pl] [vb pp] over [art] period of | 7 |
|
| 8 | [noun pl] [vb pp] during [art] period of | 5 |
|
