| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [adv] [prep] [art] period [prep] | 9 |
|
| 2 | [v-ing] [adv] [prep] [art] period [prep] | 9 |
|
| 3 | [v-ing] [adv] [prep] [art] period of | 7 |
|
| 4 | [v-ing] [adv] [prep] [art] period of | 7 |
|
| 5 | [v-ing] [adv] [prep] a period [prep] | 6 |
|
| 6 | [v-ing] [adv] [prep] a period [prep] | 6 |
|
| 7 | [v-ing] [adv prt] [prep] [art] period [prep] | 5 |
|
