| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [prep] these problems can be | 5 |
|
| 2 | [det] [prep] these problems can be | 5 |
|
| 3 | [prep] these problems can be [verb] | 5 |
|
| 4 | [prep] these problems can be [vb pp] | 5 |
|
