| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [art] [noun] | 5827 |
|
| 2 | 1991 [art] [noun] | 268 |
|
| 3 | 1991 when [art] | 22 |
|
| 4 | 1991 when [noun] | 21 |
|
