| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [prep] a period | 47 |
|
| 2 | and [prep] a period | 38 |
|
| 3 | [coord] over a period | 20 |
|
| 4 | [coord] over a period | 20 |
|
| 5 | [coord] for a period | 14 |
|
| 6 | [coord] for a period | 14 |
|
| 7 | [coord] after a period | 8 |
|
| 8 | [coord] after a period | 8 |
|
| 9 | but [prep] a period | 6 |
|
