| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] years | 820 |
|
| 2 | [prep] a million [noun] | 351 |
|
| 3 | [prep] a million [noun pl] | 288 |
|
| 4 | [prep] a [num] years | 236 |
|
| 5 | [prep] [art] million years | 42 |
|
| 6 | [prep] [art] million years | 42 |
|
| 7 | [prep] a million year | 41 |
|
| 8 | [prep] a million years | 41 |
|
| 9 | [prep] a million years | 41 |
|
