| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a [noun sg] | 17611 |
|
| 2 | vary [v-ing] [prep] [noun sg] | 51 |
|
| 3 | vary [prep] a [noun sg] | 44 |
|
| 4 | vary [v-ing] [prep] a | 5 |
|
