| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have [been] [adv] successful [prep] | 6 |
|
| 2 | [Wh det] have been [adv] successful [prep] | 6 |
|
| 3 | [Wh det] have [been] [adv] successful [prep] | 6 |
|
