| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] | 1333 |
|
| 2 | [v-ing] a [adj] [prep] | 162 |
|
| 3 | [v-ing] a period [prep] | 61 |
|
| 4 | [v-ing] a [adj] period | 46 |
|
