| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] [adj] period [prep] [adj] | 420 |
|
| 2 | [prep] [art] [adj] [noun] [prep] 1989 | 165 |
|
| 3 | [prep] [art] [adj] [noun sg] [prep] 1989 | 145 |
|
| 4 | [prep] [art] [adj] period [prep] 1989 | 16 |
|
