| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] may be [prep] [adj] | 63 |
|
| 2 | [noun pl] be caused [prep] [adj] | 36 |
|
| 3 | may be caused [prep] [adj] | 19 |
|
| 4 | [noun pl] may be caused [prep] | 11 |
|
