| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is an essential part of | 92 |
|
| 2 | are an essential part of | 20 |
|
| 3 | was an essential part of | 15 |
|
| 4 | be an essential part of | 6 |
|
| 5 | were an essential part of | 6 |
|
