| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be traced back [prep] [art] | 42 |
|
| 2 | [vb mod] be traced back to [art] | 39 |
|
| 3 | can be traced back [prep] [art] | 36 |
|
| 4 | [vb mod] be traced back [prep] the | 35 |
|
| 5 | [vb mod] be traced back [prep] the | 35 |
|
| 6 | [vb mod] be traced back [prep] a | 7 |
|
| 7 | [vb mod] be traced back [prep] a | 7 |
|
