| Count | Prefix |
|---|---|
| 100 | wf- |
| 7 | wf. |
| 2 | wf0 |
| 17 | wf1 |
| 10 | wf2 |
| 7 | wf3 |
| 7 | wf4 |
| 2 | wf5 |
| 4 | wf6 |
| 1 | wf7 |
| 5 | wf8 |
| 2 | wf9 |
| 192 | wfa |
| 133 | wfb |
| 214 | wfc |
| 105 | wfd |
| 92 | wfe |
| 149 | wff |
| 167 | wfg |
| 196 | wfh |
| 142 | wfi |
| 39 | wfj |
| 41 | wfk |
| 135 | wfl |
| 156 | wfm |
| 83 | wfn |
| 134 | wfo |
| 121 | wfp |
| 12 | wfq |
| 123 | wfr |
| 236 | wfs |
| 123 | wft |
| 71 | wfu |
| 26 | wfv |
| 75 | wfw |
| 43 | wfx |
| 24 | wfy |
| 20 | wfz |