| Count | Prefix |
|---|---|
| 10 | f-- |
| 5 | f-0 |
| 47 | f-1 |
| 19 | f-2 |
| 14 | f-3 |
| 10 | f-4 |
| 6 | f-5 |
| 5 | f-6 |
| 3 | f-7 |
| 3 | f-8 |
| 7 | f-9 |
| 171 | f-a |
| 105 | f-b |
| 163 | f-c |
| 92 | f-d |
| 68 | f-e |
| 84 | f-f |
| 56 | f-g |
| 61 | f-h |
| 116 | f-i |
| 27 | f-j |
| 61 | f-k |
| 93 | f-l |
| 137 | f-m |
| 59 | f-n |
| 84 | f-o |
| 103 | f-p |
| 7 | f-q |
| 100 | f-r |
| 260 | f-s |
| 125 | f-t |
| 53 | f-u |
| 24 | f-v |
| 53 | f-w |
| 9 | f-x |
| 21 | f-y |
| 10 | f-z |