| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] over a period of [noun sg] | 15 |
|
| 2 | [conj] over a period [prep] [noun sg] | 15 |
|
| 3 | [conj] over a period of [noun sg] | 15 |
|
| 4 | [conj] over a period [prep] time | 14 |
|
| 5 | [coord] over a period [prep] [noun sg] | 12 |
|
| 6 | and over a period [prep] [noun sg] | 8 |
|
| 7 | and over a period [prep] [noun sg] | 8 |
|
