| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] long period of | 240 |
|
| 2 | [be] [art] period of | 180 |
|
| 3 | [be] [art] long period | 16 |
|
| 4 | [be] [art] long of | 6 |
|
