| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be based [prep] a | 784 |
|
| 2 | be [prep] a [unc] | 41 |
|
| 3 | be based [prep] [unc] | 20 |
|
| 4 | based [prep] a [unc] | 11 |
|
