| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun] [prep] | 64183 |
|
| 2 | [prep] [art] [adj] period [prep] | 1247 |
|
| 3 | [prep] [art] [adj] period [prep] | 1247 |
|
| 4 | [prep] a [adj] period [prep] | 824 |
|
| 5 | [prep] a [adj] period [prep] | 773 |
|
