| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | keep [art] [noun sg] [prep] [num] years | 7 |
|
| 2 | keep [art] [noun sg] [prep] [num] year | 7 |
|
| 3 | keep [art] [noun sg] for [num] year | 6 |
|
| 4 | keep [art] [noun sg] for [num] year | 6 |
|
