| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj -er] [noun] [prep] | 2838 |
|
| 2 | [prep] a [adj] period [prep] | 871 |
|
| 3 | [prep] [art] [adj -er] period [prep] | 60 |
|
| 4 | [prep] a [adj -er] period [prep] | 46 |
|
