| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [verb] a [adj] period [prep] | 9 |
|
| 2 | [noun prp] [verb] a [adj] period [prep] | 8 |
|
| 3 | [noun prp] [verb] a [adj] period of | 7 |
|
| 4 | [noun prp] [vb past] a [adj] period [prep] | 6 |
|
