| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the long period of | 16 |
|
| 2 | [prep] the long period of | 10 |
|
| 3 | during the long period of | 6 |
|
| 4 | during the long period of | 6 |
|
| 5 | [prep] the longest period of | 6 |
|
