| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] years of [noun sg] | 18 |
|
| 2 | [prep] a few years of [noun sg] | 12 |
|
| 3 | [prep] a [det] years of [noun sg] | 12 |
|
| 4 | [prep] a few years of [noun sg] | 12 |
|
| 5 | within a [adj] years of [noun sg] | 7 |
|
| 6 | [prep] a [num] years of [noun sg] | 6 |
|
