| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 1973 when [art] | 8 |
|
| 2 | [prep] 1973 when [art] | 8 |
|
| 3 | [prep] 1973 when [art] | 8 |
|
| 4 | [prep] 1973 when the | 6 |
|
| 5 | [prep] 1973 when the | 6 |
|
| 6 | in 1973 when [art] | 5 |
|
| 7 | in 1973 when [art] | 5 |
|
