| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] have been possible without | 20 |
|
| 2 | not have [been] possible without | 18 |
|
| 3 | [not/n't] have [been] possible without | 18 |
|
| 4 | not have [been] possible without | 17 |
|
