| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been the | 142 |
|
| 2 | which have [been] the | 142 |
|
| 3 | which had [been] the | 74 |
|
| 4 | which has [been] the | 45 |
|
| 5 | which have [been] the | 23 |
|
