| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] used for [adj] | 61 |
|
| 2 | [verb] [been] for [adj] years | 45 |
|
| 3 | [been] used for [adj] years | 15 |
|
| 4 | [verb] [been] used for years | 6 |
|
