| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the [num ord] thirty years | 95 |
|
| 2 | [noun] [prep] the [num ord] years | 78 |
|
| 3 | [noun] [prep] the [num ord] thirty | 49 |
|
| 4 | [noun] [prep] the thirty years | 26 |
|
