| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 1973 when [art] [noun] | 7 |
|
| 2 | in 1973 when [art] [noun] | 5 |
|
| 3 | [prep] 1973 when [art] [noun sg] | 5 |
|
| 4 | [prep] 1973 when the [noun] | 5 |
|
| 5 | [prep] 1973 when the [noun] | 5 |
|
