| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] for [art] period | 45 |
|
| 2 | [adv] for a period | 37 |
|
| 3 | [adv] for the period | 18 |
|
| 4 | [adv prt] for [art] period | 10 |
|
