| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | vary [prep] year to [noun sg] | 10 |
|
| 2 | vary from year to [noun sg] | 10 |
|
| 3 | vary [prep] year to [noun sg] | 10 |
|
| 4 | vary from year to [noun sg] | 10 |
|
| 5 | vary [prep] year to year | 10 |
|
