| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun sg] of years [coord] | 75 |
|
| 2 | a [noun sg] of years and | 59 |
|
| 3 | a number of years [coord] | 35 |
|
| 4 | a couple of years [coord] | 26 |
|
| 5 | a [noun sg] of years or | 9 |
|
| 6 | a period of years [coord] | 7 |
|
| 7 | a [noun sg] of years but | 7 |
|
