| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1796 |
|
| 2 | [prep] a [adj] [subord] | 286 |
|
| 3 | a [adj] period [subord] | 62 |
|
| 4 | [prep] [adj] period [subord] | 37 |
|
| 5 | [prep] a period [subord] | 21 |
|
