| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [adv] a | 2910 |
|
| 2 | not [adv] a | 2886 |
|
| 3 | [adv] often a | 138 |
|
| 4 | not often [art] | 13 |
|
| 5 | not often a | 8 |
|
| 6 | not often a | 8 |
|
| 7 | [not/n't] often a | 8 |
|
