| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for [art] period of | 398 |
|
| 2 | for [art] period of | 398 |
|
| 3 | for a period of | 339 |
|
| 4 | for a period of | 339 |
|
| 5 | for the period of | 58 |
|
| 6 | for the period of | 58 |
|
