| Count | Prefix |
|---|---|
| 144 | bf- |
| 13 | bf. |
| 2 | bf0 |
| 20 | bf1 |
| 14 | bf2 |
| 12 | bf3 |
| 10 | bf4 |
| 4 | bf5 |
| 1 | bf6 |
| 1 | bf7 |
| 2 | bf8 |
| 3 | bf9 |
| 291 | bfa |
| 125 | bfb |
| 296 | bfc |
| 131 | bfd |
| 145 | bfe |
| 140 | bff |
| 196 | bfg |
| 96 | bfh |
| 294 | bfi |
| 34 | bfj |
| 72 | bfk |
| 227 | bfl |
| 201 | bfm |
| 82 | bfn |
| 189 | bfo |
| 151 | bfp |
| 19 | bfq |
| 220 | bfr |
| 323 | bfs |
| 144 | bft |
| 90 | bfu |
| 59 | bfv |
| 141 | bfw |
| 32 | bfx |
| 25 | bfy |
| 28 | bfz |