| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] period of | 21 |
|
| 2 | [adv] periods [prep] | 17 |
|
| 3 | [adv prt] period [prep] | 14 |
|
| 4 | [adv] period [prep] | 9 |
|
| 5 | [adv] period [prep] | 9 |
|
| 6 | up period [prep] | 7 |
|
| 7 | up period [prep] | 7 |
|
