| Count | Prefix |
|---|---|
| 2,135 | f- |
| 17 | f. |
| 161 | f0 |
| 1,725 | f1 |
| 442 | f2 |
| 274 | f3 |
| 313 | f4 |
| 228 | f5 |
| 86 | f6 |
| 91 | f7 |
| 246 | f8 |
| 95 | f9 |
| 125,811 | fa |
| 4,792 | fb |
| 7,025 | fc |
| 3,188 | fd |
| 57,052 | fe |
| 4,420 | ff |
| 2,070 | fg |
| 2,669 | fh |
| 141,509 | fi |
| 2,410 | fj |
| 1,268 | fk |
| 88,076 | fl |
| 5,984 | fm |
| 3,137 | fn |
| 118,468 | fo |
| 4,032 | fp |
| 392 | fq |
| 129,071 | fr |
| 6,912 | fs |
| 4,565 | ft |
| 71,316 | fu |
| 1,057 | fv |
| 2,232 | fw |
| 2,390 | fx |
| 2,435 | fy |
| 768 | fz |