| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | under 30 per [no cls] [prep] | 6 |
|
| 2 | under 30 per [unc] [prep] | 6 |
|
| 3 | under 30 per cent [prep] | 6 |
|
| 4 | under 30 per cent [prep] | 6 |
|
