| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [prep] a [noun] | 20054 |
|
| 2 | [prep] [noun] [prep] a [noun sg] | 18840 |
|
| 3 | [prep] [noun] [prep] [art] period | 402 |
|
| 4 | [prep] [noun] [prep] [art] period | 402 |
|
| 5 | [prep] [noun] [prep] a period | 155 |
|
| 6 | [prep] [noun] [prep] a period | 155 |
|
| 7 | [prep] [noun] [prep] a period | 155 |
|
