| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | often [subord] [adv] a | 18 |
|
| 2 | often [subord] [adv] a | 17 |
|
| 3 | often than [adv] a | 12 |
|
| 4 | often [subord] not a | 9 |
|
| 5 | often [subord] [not/n't] a | 9 |
|
| 6 | often [subord] not a | 9 |
|
| 7 | often [subord] [adv] a | 9 |
|
| 8 | often [subord] once a | 6 |
|
| 9 | often as [adv] a | 6 |
|
| 10 | often [subord] once a | 6 |
|
