| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [verb] on | 24230 |
|
| 2 | [noun] concentrate on | 688 |
|
| 3 | [noun sg] concentrate [prep] | 473 |
|
| 4 | [noun sg] concentrate [prep] | 473 |
|
| 5 | [noun sg] concentrate on | 406 |
|
