| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at least [adv] far back [subord] | 5 |
|
| 2 | at least [adv] far back [conj] | 5 |
|
| 3 | at least [adv] far back as | 5 |
|
| 4 | at least [adv] far back as | 5 |
|
