| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [art] very [adj] period | 16 |
|
| 2 | [be] [art] very [adj] period | 16 |
|
| 3 | [be] a very [adj] period | 15 |
|
| 4 | [was/were] [art] very [adj] period | 8 |
|
| 5 | was [art] very [adj] period | 7 |
|
| 6 | [be] [art] very difficult period | 5 |
|
| 7 | [be] [art] very difficult period | 5 |
|
