| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] on the | 4711 |
|
| 2 | [noun sg] concentrate on the | 137 |
|
| 3 | [prep] concentrate on the | 61 |
|
| 4 | [prep] [noun sg] concentrate on | 40 |
|
