| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun prp] over a period of | 6 |
|
| 2 | [prep] [noun prp] over a period of | 6 |
|
| 3 | [noun prp] [noun] over a period of | 6 |
|
| 4 | [noun prp] over a period of [adj] | 6 |
|
| 5 | [noun prp] over a period of [num] | 5 |
|
