| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used for many year | 12 |
|
| 2 | [be] used for many years | 12 |
|
| 3 | [be] used for many year | 12 |
|
| 4 | been used for many year | 11 |
|
| 5 | [been] used for many year | 11 |
|
