| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] over a period of | 165 |
|
| 2 | [coord] over a period of | 18 |
|
| 3 | [noun sg] [coord] a period of | 11 |
|
| 4 | [noun sg] [coord] over a period | 6 |
|
