| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] past 20 [noun pl] the | 5 |
|
| 2 | [prep] [art] past 20 [noun pl] the | 5 |
|
| 3 | [prep] the past 20 [noun pl] the | 5 |
|
| 4 | [prep] [art] past 20 years the | 5 |
|
