| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can be traced back [prep] | 82 |
|
| 2 | can [be] traced back [prep] | 82 |
|
| 3 | can [be] traced back [prep] | 82 |
|
| 4 | can [be] traced back to | 70 |
|
| 5 | can [be] traced back to | 70 |
|
| 6 | can [be] traced back through | 5 |
|
| 7 | can [be] traced back through | 5 |
|
