| Count | Prefix |
|---|---|
| 59 | kf- |
| 21 | kf. |
| 2 | kf0 |
| 14 | kf1 |
| 9 | kf2 |
| 5 | kf3 |
| 5 | kf4 |
| 8 | kf5 |
| 10 | kf6 |
| 4 | kf7 |
| 7 | kf8 |
| 6 | kf9 |
| 244 | kfa |
| 82 | kfb |
| 293 | kfc |
| 66 | kfd |
| 86 | kfe |
| 66 | kff |
| 49 | kfg |
| 66 | kfh |
| 173 | kfi |
| 19 | kfj |
| 36 | kfk |
| 111 | kfl |
| 119 | kfm |
| 55 | kfn |
| 213 | kfo |
| 81 | kfp |
| 12 | kfq |
| 112 | kfr |
| 175 | kfs |
| 87 | kft |
| 82 | kfu |
| 60 | kfv |
| 62 | kfw |
| 23 | kfx |
| 16 | kfy |
| 506 | kfz |