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