| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] used [prep] many [noun pl] | 17 |
|
| 2 | been used [prep] many [noun pl] | 17 |
|
| 3 | [been] used for many [noun pl] | 13 |
|
| 4 | [been] used [prep] many years | 12 |
|
