| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] is an | 6015 |
|
| 2 | problem is [art] | 252 |
|
| 3 | problem is [art] | 252 |
|
| 4 | problem is a | 68 |
|
| 5 | problem [be] an | 14 |
|
| 6 | problem be an | 14 |
|
| 7 | problem [is] an | 13 |
|
