| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] when [art] [noun sg] | 143 |
|
| 2 | [noun prp] 1991 [art] [noun sg] | 130 |
|
| 3 | [noun prp] 1991 when [art] | 14 |
|
| 4 | 1991 when [art] [noun sg] | 10 |
|
