| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 2001 |
|
| 2 | [prep] a [adj] period | 1820 |
|
| 3 | [prep] a five-year [noun sg] | 246 |
|
| 4 | [prep] a five-year [noun] | 246 |
|
| 5 | [prep] [art] five-year period | 49 |
|
| 6 | [prep] a five-year period | 35 |
|
| 7 | [prep] a five-year period | 35 |
|
| 8 | [prep] a five-year period | 35 |
|
