| Count | Prefix |
|---|---|
| 109 | fd- |
| 13 | fd. |
| 6 | fd0 |
| 15 | fd1 |
| 15 | fd2 |
| 8 | fd3 |
| 6 | fd4 |
| 3 | fd5 |
| 1 | fd6 |
| 2 | fd7 |
| 4 | fd8 |
| 3 | fd9 |
| 344 | fda |
| 91 | fdb |
| 301 | fdc |
| 79 | fdd |
| 149 | fde |
| 97 | fdf |
| 106 | fdg |
| 77 | fdh |
| 247 | fdi |
| 47 | fdj |
| 33 | fdk |
| 212 | fdl |
| 198 | fdm |
| 151 | fdn |
| 116 | fdo |
| 226 | fdp |
| 10 | fdq |
| 180 | fdr |
| 295 | fds |
| 112 | fdt |
| 64 | fdu |
| 37 | fdv |
| 52 | fdw |
| 28 | fdx |
| 19 | fdy |
| 18 | fdz |