| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] when [art] [noun sg] | 164 |
|
| 2 | [prep] 1973 [art] [noun sg] | 21 |
|
| 3 | [prep] 1973 when [art] | 8 |
|
| 4 | 1973 when [art] [noun sg] | 7 |
|
