| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [is] [noun] | 868 |
|
| 2 | [is] [noun] [letter] | 344 |
|
| 3 | what [noun] [letter] | 50 |
|
| 4 | what [is] [letter] | 47 |
|
