| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [art] problem for | 15 |
|
| 2 | [been] [art] problem for | 15 |
|
| 3 | [been] a problem for | 15 |
|
| 4 | been [art] problem for | 15 |
|
| 5 | [been] a problem for | 15 |
|
