| Count | Prefix |
|---|---|
| 113 | fw- |
| 20 | fw. |
| 4 | fw0 |
| 19 | fw1 |
| 15 | fw2 |
| 7 | fw3 |
| 7 | fw4 |
| 4 | fw5 |
| 2 | fw6 |
| 6 | fw7 |
| 3 | fw8 |
| 3 | fw9 |
| 190 | fwa |
| 125 | fwb |
| 211 | fwc |
| 230 | fwd |
| 107 | fwe |
| 81 | fwf |
| 90 | fwg |
| 87 | fwh |
| 116 | fwi |
| 16 | fwj |
| 17 | fwk |
| 60 | fwl |
| 101 | fwm |
| 44 | fwn |
| 104 | fwo |
| 109 | fwp |
| 7 | fwq |
| 73 | fwr |
| 194 | fws |
| 91 | fwt |
| 44 | fwu |
| 18 | fwv |
| 63 | fww |
| 8 | fwx |
| 21 | fwy |
| 17 | fwz |