| Count | Prefix |
|---|---|
| 141 | mf- |
| 19 | mf. |
| 9 | mf0 |
| 17 | mf1 |
| 17 | mf2 |
| 11 | mf3 |
| 6 | mf4 |
| 2 | mf5 |
| 4 | mf6 |
| 2 | mf7 |
| 5 | mf8 |
| 4 | mf9 |
| 428 | mfa |
| 146 | mfb |
| 390 | mfc |
| 121 | mfd |
| 175 | mfe |
| 102 | mff |
| 518 | mfg |
| 85 | mfh |
| 350 | mfi |
| 42 | mfj |
| 93 | mfk |
| 210 | mfl |
| 204 | mfm |
| 69 | mfn |
| 263 | mfo |
| 186 | mfp |
| 9 | mfq |
| 317 | mfr |
| 301 | mfs |
| 171 | mft |
| 101 | mfu |
| 39 | mfv |
| 86 | mfw |
| 42 | mfx |
| 25 | mfy |
| 23 | mfz |