| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] years of [noun] | 1934 |
|
| 2 | twenty years of [noun] | 42 |
|
| 3 | twenty [num] years of | 16 |
|
| 4 | twenty [num] of [noun] | 13 |
|
| 5 | twenty [num] years [noun] | 10 |
|
