| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [prep] a period | 218 |
|
| 2 | [noun pl] over a period | 109 |
|
| 3 | [noun pl] over a period | 109 |
|
| 4 | [noun pl] for a period | 56 |
|
| 5 | [noun pl] for a period | 56 |
|
| 6 | [noun pl] in a period | 16 |
|
| 7 | [noun pl] in a period | 16 |
|
| 8 | [noun pl] during a period | 11 |
|
| 9 | [noun pl] during a period | 11 |
|
| 10 | [noun pl] after a period | 8 |
|
| 11 | [noun pl] after a period | 8 |
|
| 12 | times [prep] a period | 5 |
|
