| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that [art] period of | 33 |
|
| 2 | that [art] period of | 33 |
|
| 3 | that the period of | 25 |
|
| 4 | that the period of | 25 |
|
| 5 | that a period of | 8 |
|
| 6 | that a period of | 8 |
|
