| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [prep] a long | 365 |
|
| 2 | [prep] a long period | 305 |
|
| 3 | [adj] [prep] a period | 97 |
|
| 4 | [adj] [prep] long period | 40 |
|
| 5 | [adj] a long period | 13 |
|
