| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] on | 170862 |
|
| 2 | [vb pp] on | 67896 |
|
| 3 | concentrate on | 3803 |
|
| 4 | concentrated [prep] | 1435 |
|
| 5 | concentrated [prep] | 1435 |
|
| 6 | concentrated on | 695 |
|
