| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [prep] [noun sg] | 33139 |
|
| 2 | [prep] a [noun sg] [prep] [noun sg] | 32490 |
|
| 3 | [prep] [art] period [prep] [noun sg] | 802 |
|
| 4 | [prep] a period [prep] [noun] | 608 |
|
| 5 | [prep] a period [prep] [noun sg] | 477 |
|
