| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] letter | 679 |
|
| 2 | a [adj] letter | 615 |
|
| 3 | a [adj] letters | 41 |
|
| 4 | a long letter | 39 |
|
| 5 | a long letter | 37 |
|
| 6 | a [det] letter | 35 |
|
| 7 | a few letter | 33 |
|
| 8 | a few letter | 33 |
|
| 9 | a covering letter | 28 |
|
| 10 | a covering letter | 28 |
|
| 11 | a personal letter | 25 |
|
| 12 | a [num ord] letter | 25 |
|
| 13 | a personal letter | 25 |
|
| 14 | a [num] letter | 24 |
|
| 15 | a [adj -er] letter | 21 |
|
| 16 | a recent letter | 19 |
|
| 17 | a recent letter | 19 |
|
| 18 | a single letter | 18 |
|
| 19 | a single letter | 18 |
|
| 20 | a dead letter | 17 |
|
| 21 | a second letter | 17 |
|
| 22 | a second letter | 17 |
|
| 23 | a dead letter | 17 |
|
| 24 | a formal letter | 16 |
|
| 25 | a formal letter | 16 |
|
| 26 | a far letter | 16 |
|
| 27 | a further letter | 16 |
|
| 28 | a capital letter | 15 |
|
| 29 | a capital letter | 15 |
|
| 30 | a nice letter | 13 |
|
