| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | within a [adj] period [prep] | 41 |
|
| 2 | [vb pp] a [adj] period [prep] | 22 |
|
| 3 | [vb pp] within a [adj] period | 21 |
|
| 4 | [vb pp] within a period [prep] | 17 |
|
