| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] period in | 12 |
|
| 2 | [prep] period in | 12 |
|
| 3 | [prep] periods in | 10 |
|
| 4 | of period in | 7 |
|
| 5 | of period in | 7 |
|
