| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] [art] period of | 12 |
|
| 2 | [prep] [adj] a period [prep] | 10 |
|
| 3 | [prep] [det] [art] period [prep] | 10 |
|
| 4 | [prep] such [art] period [prep] | 8 |
|
| 5 | [prep] such [art] period [prep] | 8 |
|
