| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] by a [adj] period [prep] | 11 |
|
| 2 | [verb] by a [adj] period [prep] | 10 |
|
| 3 | [vb pp] by a [adj] period [prep] | 10 |
|
| 4 | [verb] by a [adj] period of | 6 |
|
