| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [conj] [adj] [noun] | 1270 |
|
| 2 | essential [conj] [adj] [noun] | 151 |
|
| 3 | is essential [conj] [adj] | 103 |
|
| 4 | is essential [conj] [noun] | 83 |
|
