| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reason for the failure [prep] | 15 |
|
| 2 | reason for the failure of | 15 |
|
| 3 | reason for the failure of | 15 |
|
| 4 | reason for the failure [prep] | 14 |
|
| 5 | reason for the failure [prep] | 11 |
|
