| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a [noun] | 131396 |
|
| 2 | [noun sg] [prep] [art] period | 1747 |
|
| 3 | [noun sg] [prep] [art] period | 1747 |
|
| 4 | [noun] [prep] a period | 832 |
|
| 5 | [noun sg] [prep] a period | 558 |
|
