| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period | 391 |
|
| 2 | [prep] [det] a long | 108 |
|
| 3 | [prep] [det] a period | 19 |
|
| 4 | [det] a long period | 13 |
|
| 5 | [prep] [det] long period | 6 |
|
