| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been a [adj] factor | 69 |
|
| 2 | been a major factor | 25 |
|
| 3 | been a contributory factor | 9 |
|
| 4 | been a key factor | 8 |
|
| 5 | been a significant factor | 5 |
|
