| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [art] letter to [noun] | 20 |
|
| 2 | [vb pp] [art] letter to [noun] | 20 |
|
| 3 | [vb pp] a letter to [noun] | 18 |
|
| 4 | [vb pp] a letter to [noun] | 18 |
|
| 5 | [vb pp] [art] letter to [noun prp] | 17 |
|
| 6 | written [art] letter to [noun] | 11 |
|
| 7 | sent [art] letter to [noun] | 5 |
|
