| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and [art] period of [adj] | 20 |
|
| 2 | and [art] period of [adj] | 20 |
|
| 3 | and a period of [adj] | 17 |
|
| 4 | and [art] period of [num] | 12 |
|
| 5 | and [art] period of [adj] | 8 |
|
