| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used [prep] [adj] | 127 |
|
| 2 | been [prep] [adj] years | 10 |
|
| 3 | been used [prep] years | 10 |
|
| 4 | used [prep] [adj] years | 8 |
|
