| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a period [prep] | 138 |
|
| 2 | [adv] [prep] a period of | 129 |
|
| 3 | [adv] [prep] a period of | 129 |
|
| 4 | [adv] [prep] a period [prep] | 93 |
|
| 5 | [adv] over a period [prep] | 60 |
|
| 6 | [adv prt] [prep] a period [prep] | 44 |
|
| 7 | [adv] for a period [prep] | 26 |
|
| 8 | [adv] after a period [prep] | 17 |
|
| 9 | up [prep] a period [prep] | 14 |
|
| 10 | up [prep] a period [prep] | 14 |
|
| 11 | [adv] in a period [prep] | 11 |
|
| 12 | gradually [prep] a period [prep] | 7 |
|
| 13 | out [prep] a period [prep] | 7 |
|
| 14 | out [prep] a period [prep] | 7 |
|
| 15 | gradually [prep] a period [prep] | 7 |
|
| 16 | only [prep] a period [prep] | 5 |
|
| 17 | on [prep] a period [prep] | 5 |
|
| 18 | back [prep] a period [prep] | 5 |
|
| 19 | only [prep] a period [prep] | 5 |
|
| 20 | on [prep] a period [prep] | 5 |
|
| 21 | [adv] during a period [prep] | 5 |
|
| 22 | back [prep] a period [prep] | 5 |
|
