| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] used for | 219 |
|
| 2 | [det] [am/are] used | 67 |
|
| 3 | [det] [am/are] for | 50 |
|
| 4 | [det] used for | 39 |
|
