| Count | Prefix |
|---|---|
| 91 | pf- |
| 17 | pf. |
| 2 | pf0 |
| 10 | pf1 |
| 9 | pf2 |
| 8 | pf3 |
| 5 | pf4 |
| 2 | pf5 |
| 2 | pf6 |
| 3 | pf7 |
| 1 | pf8 |
| 3 | pf9 |
| 1,083 | pfa |
| 91 | pfb |
| 327 | pfc |
| 107 | pfd |
| 1,017 | pfe |
| 120 | pff |
| 150 | pfg |
| 66 | pfh |
| 603 | pfi |
| 22 | pfj |
| 45 | pfk |
| 1,251 | pfl |
| 219 | pfm |
| 83 | pfn |
| 245 | pfo |
| 198 | pfp |
| 11 | pfq |
| 173 | pfr |
| 374 | pfs |
| 120 | pft |
| 162 | pfu |
| 30 | pfv |
| 65 | pfw |
| 30 | pfx |
| 23 | pfy |
| 22 | pfz |