| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] a [adj] period [prep] | 32 |
|
| 2 | [v-ing] a [adj] period [prep] | 29 |
|
| 3 | [v-ing] a [adj] period of | 21 |
|
| 4 | [v-ing] a [adj] period of | 21 |
|
| 5 | following a [adj] period [prep] | 9 |
|
| 6 | [v-ing] a brief period [prep] | 5 |
|
| 7 | [v-ing] a brief period [prep] | 5 |
|
