| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1796 |
|
| 2 | [prep] [adj] period [be] | 222 |
|
| 3 | [prep] a [adj] [be] | 75 |
|
| 4 | a [adj] period [be] | 46 |
|
| 5 | [prep] a period [be] | 5 |
|
