| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is essential [prep] | 101 |
|
| 2 | it is essential [prep] | 101 |
|
| 3 | it is essential for | 71 |
|
| 4 | it is essential for | 71 |
|
| 5 | it is essential to | 21 |
|
| 6 | it is essential to | 21 |
|
| 7 | it is essential in | 5 |
|
| 8 | it is essential in | 5 |
|
