| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have previously been show [prep] | 9 |
|
| 2 | have previously [been] shown [prep] | 9 |
|
| 3 | have previously [been] show to | 8 |
|
| 4 | has previously [been] show [prep] | 8 |
|
