| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] [adj] years | 346 |
|
| 2 | [noun] [prep] twenty years | 157 |
|
| 3 | [noun sg] [prep] twenty years | 120 |
|
| 4 | period [prep] twenty [noun] | 14 |
|
| 5 | period [prep] twenty [noun pl] | 14 |
|
| 6 | period [prep] twenty years | 13 |
|
| 7 | period [prep] twenty year | 13 |
|
| 8 | period [prep] twenty years | 13 |
|
