| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which had been used [prep] [adj] | 8 |
|
| 2 | which had been used [prep] [adj] | 8 |
|
| 3 | which had been used for [adj] | 5 |
|
| 4 | which had been used for [adj] | 5 |
|
