| Count | Prefix |
|---|---|
| 223 | hf- |
| 19 | hf. |
| 3 | hf0 |
| 19 | hf1 |
| 13 | hf2 |
| 7 | hf3 |
| 4 | hf4 |
| 4 | hf5 |
| 3 | hf6 |
| 5 | hf7 |
| 5 | hf8 |
| 5 | hf9 |
| 155 | hfa |
| 90 | hfb |
| 260 | hfc |
| 92 | hfd |
| 95 | hfe |
| 88 | hff |
| 108 | hfg |
| 171 | hfh |
| 152 | hfi |
| 39 | hfj |
| 50 | hfk |
| 120 | hfl |
| 188 | hfm |
| 55 | hfn |
| 113 | hfo |
| 123 | hfp |
| 10 | hfq |
| 132 | hfr |
| 240 | hfs |
| 130 | hft |
| 63 | hfu |
| 26 | hfv |
| 66 | hfw |
| 41 | hfx |
| 30 | hfy |
| 26 | hfz |