| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] used [prep] [det] | 101 |
|
| 2 | [been] [prep] [det] years | 38 |
|
| 3 | used [prep] [det] years | 22 |
|
| 4 | [been] used [prep] years | 10 |
|
