| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a period of | 60 |
|
| 2 | [adv prt] over a [noun] of | 44 |
|
| 3 | [adv prt] over a [noun sg] of | 43 |
|
| 4 | [adv prt] [prep] a period of | 41 |
|
| 5 | [adv prt] [prep] a period of | 41 |
|
| 6 | [adv prt] over [art] period of | 27 |
|
| 7 | [adv prt] over [art] period of | 27 |
|
| 8 | [adv prt] over a period of | 25 |
|
| 9 | [adv prt] over a period [prep] | 25 |
|
| 10 | [adv prt] over a period of | 25 |
|
| 11 | [adv prt] over a period [prep] | 25 |
|
| 12 | [adv prt] over a period of | 25 |
|
| 13 | [adv prt] over a period of | 25 |
|
