| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] over a period | 20 |
|
| 2 | and over a period | 14 |
|
| 3 | and over a period | 14 |
|
| 4 | [that] over a period | 6 |
|
| 5 | that over a period | 6 |
|
| 6 | that over a period | 6 |
|
