| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | occurs [prep] [adj] period [prep] | 5 |
|
| 2 | occurs [prep] any period [prep] | 5 |
|
| 3 | occurs [prep] [adj] period of | 5 |
|
| 4 | occurs [prep] [det] period [prep] | 5 |
|
| 5 | occurs during [adj] period [prep] | 5 |
|
| 6 | occurs [prep] [adj] period of | 5 |
|
| 7 | occurs [prep] any period [prep] | 5 |
|
