| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] useful source of [noun] for | 9 |
|
| 2 | a useful source of [noun] for | 9 |
|
| 3 | a useful source of [noun] for | 9 |
|
| 4 | [art] useful source of [noun] for | 9 |
|
