| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] used [prep] [adj] purpose | 9 |
|
| 2 | [am/are] used [prep] [adj] purposes | 9 |
|
| 3 | are used [prep] [adj] purpose | 9 |
|
| 4 | [am/are] used for [adj] purpose | 9 |
|
| 5 | [am/are] used for [adj] purpose | 9 |
|
