| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used for [adj] years | 15 |
|
| 2 | been used [prep] [det] years | 14 |
|
| 3 | been used [prep] many years | 12 |
|
| 4 | been used [prep] many years | 12 |
|
| 5 | been used in [adj] years | 5 |
|
| 6 | been used [prep] [adj] years | 5 |
|
