| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | over a [adj] period | 462 |
|
| 3 | [prep] a six-month period | 18 |
|
| 4 | [prep] a six-month period | 18 |
|
| 5 | over [art] six-month period | 7 |
|
| 6 | over [art] six-month period | 7 |
|
| 7 | over a six-month [noun] | 7 |
|
| 8 | over a six-month period | 7 |
|
| 9 | over a six-month period | 7 |
|
| 10 | over a six-month period | 7 |
|
