| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a period [prep] [noun] [prep] | 193 |
|
| 2 | period [prep] [noun] [prep] the | 173 |
|
| 3 | a period [prep] [noun] the | 14 |
|
| 4 | a [prep] [noun] [prep] the | 9 |
|
