| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [prep] a [noun] [prep] | 12150 |
|
| 2 | [noun pl] [prep] a [noun sg] [prep] | 11672 |
|
| 3 | [noun] [prep] a period [prep] | 700 |
|
| 4 | [noun pl] [prep] [art] period [prep] | 363 |
|
| 5 | [noun pl] [prep] a period [prep] | 193 |
|
