| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [verb] at [art] | 1347 |
|
| 2 | [is] [vb pp] at [art] | 905 |
|
| 3 | [is] required [prep] [art] | 235 |
|
| 4 | [is] required [prep] [art] | 235 |
|
| 5 | [be] required at [art] | 18 |
|
| 6 | [is] required at [art] | 10 |
|
| 7 | [is] require at [art] | 10 |
|
