| Count | Prefix |
|---|---|
| 2,271 | f- |
| 21 | f. |
| 167 | f0 |
| 1,794 | f1 |
| 486 | f2 |
| 289 | f3 |
| 339 | f4 |
| 241 | f5 |
| 99 | f6 |
| 98 | f7 |
| 254 | f8 |
| 102 | f9 |
| 131,603 | fa |
| 5,151 | fb |
| 7,512 | fc |
| 3,474 | fd |
| 59,806 | fe |
| 4,739 | ff |
| 2,287 | fg |
| 2,877 | fh |
| 148,622 | fi |
| 2,553 | fj |
| 1,409 | fk |
| 91,939 | fl |
| 6,505 | fm |
| 3,381 | fn |
| 123,854 | fo |
| 4,390 | fp |
| 411 | fq |
| 133,927 | fr |
| 7,500 | fs |
| 4,979 | ft |
| 73,921 | fu |
| 1,164 | fv |
| 2,427 | fw |
| 2,521 | fx |
| 2,582 | fy |
| 816 | fz |