| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [prep] be used [prep] the | 16 |
|
| 2 | is to be used [prep] the | 16 |
|
| 3 | is to be used [prep] the | 16 |
|
| 4 | is [prep] be used in the | 5 |
|
