| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] is a necessary part | 8 |
|
| 2 | [noun sg] is a necessary part | 6 |
|
| 3 | is a necessary part of | 18 |
|
| 4 | is a necessary part of | 18 |
|
| 5 | is a necessary part [prep] | 18 |
|
| 6 | is a necessary part [prep] | 18 |
|
