| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [prep] [adj] years | 924 |
|
| 2 | [noun prp] [prep] [num] years | 644 |
|
| 3 | [noun] [prep] 20 years | 237 |
|
| 4 | [noun prp] [prep] 20 [noun] | 110 |
|
| 5 | [noun prp] [prep] 20 [noun pl] | 44 |
|
| 6 | [noun prp] [prep] 20 years | 28 |
|
| 7 | [noun prp] [prep] 20 year | 28 |
|
| 8 | [noun prp] [prep] 20 years | 28 |
|
