| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | essential to the success | 11 |
|
| 2 | essential to the development | 10 |
|
| 3 | essential to the maintenance | 7 |
|
| 4 | essential to the well-being | 6 |
|
| 5 | essential to the understanding | 5 |
|
