| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] may have been base | 6 |
|
| 2 | [noun sg] may have been base | 5 |
|
| 3 | may have been base [prep] | 6 |
|
| 4 | may have been base [prep] | 6 |
|
| 5 | may have been base on | 5 |
|
| 6 | may have been base on | 5 |
|
