| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the 1971 census | 10 |
|
| 2 | [prep] the 1971 census | 10 |
|
| 3 | the 1971 census [prep] | 6 |
|
| 4 | the 1971 census [prep] | 6 |
|
