| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an essential part [prep] the process | 12 |
|
| 2 | a essential part [prep] the process | 12 |
|
| 3 | a essential part [prep] the process | 12 |
|
| 4 | a essential part of the process | 12 |
|
