| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a period of | 129 |
|
| 2 | [adv] [prep] a period of | 129 |
|
| 3 | [adv] [prep] a period of | 87 |
|
| 4 | [adv] over a period of | 60 |
|
| 5 | [adv prt] [prep] a period of | 41 |
|
| 6 | [adv] for a period of | 23 |
|
| 7 | [adv] after a period of | 16 |
|
| 8 | up [prep] a period of | 14 |
|
| 9 | up [prep] a period of | 14 |
|
| 10 | [adv] in a period of | 10 |
|
| 11 | out [prep] a period of | 7 |
|
| 12 | gradually [prep] a period of | 7 |
|
| 13 | gradually [prep] a period of | 7 |
|
| 14 | out [prep] a period of | 7 |
|
| 15 | only [prep] a period of | 5 |
|
| 16 | only [prep] a period of | 5 |
|
