| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be cause [prep] [adj] [noun pl] | 7 |
|
| 2 | may be caused [prep] [adj] [noun pl] | 7 |
|
| 3 | may be cause by [adj] [noun pl] | 6 |
|
| 4 | may be cause by [adj] [noun pl] | 6 |
|
