| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] concentrate on the | 137 |
|
| 2 | [prep] concentrate on the | 61 |
|
| 3 | [noun sg] [prep] on the | 58 |
|
| 4 | [noun sg] [prep] concentrate on | 49 |
|
