| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has long been used [prep] | 10 |
|
| 2 | have long been used as | 9 |
|
| 3 | have long been used by | 5 |
|
| 4 | have long been used [prep] | 5 |
|
| 5 | had long been used [prep] | 5 |
|
