| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it compulsory for [noun pl] | 6 |
|
| 2 | make it compulsory for [noun pl] | 6 |
|
| 3 | it compulsory for [noun pl] [verb] | 5 |
|
| 4 | it compulsory for [noun pl] [to-vb] | 5 |
|
