| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [art] [adv] difficult [noun] | 223 |
|
| 2 | [be] [art] [adv] difficult [noun sg] | 217 |
|
| 3 | [be] [art] [adv] [adj] period | 47 |
|
| 4 | [be] [art] [adv] difficult period | 6 |
|
| 5 | [be] [art] [adv] difficult period | 6 |
|
