| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] least [num] year 's [noun] | 6 |
|
| 2 | at least [num] year 's [noun] | 6 |
|
| 3 | [prep] least [num] year 's [noun sg] | 6 |
|
| 4 | [prep] least one year 's [noun] | 5 |
|
