| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [prep] a [adj] period | 29 |
|
| 2 | [noun prp] [prep] a [adj] period | 27 |
|
| 3 | [noun prp] for a [adj] period | 14 |
|
| 4 | [noun prp] over a [adj] period | 9 |
|
| 5 | [noun prp] [prep] a short period | 5 |
|
| 6 | [noun prp] [prep] a short period | 5 |
|
