| Count | Prefix |
|---|---|
| 4,859 | c- |
| 28 | c. |
| 326 | c0 |
| 557 | c1 |
| 2,177 | c2 |
| 925 | c3 |
| 867 | c4 |
| 234 | c5 |
| 184 | c6 |
| 121 | c7 |
| 132 | c8 |
| 148 | c9 |
| 354,809 | ca |
| 11,487 | cb |
| 20,895 | cc |
| 13,071 | cd |
| 85,019 | ce |
| 8,515 | cf |
| 6,278 | cg |
| 249,196 | ch |
| 76,358 | ci |
| 4,260 | cj |
| 3,403 | ck |
| 121,074 | cl |
| 14,704 | cm |
| 18,054 | cn |
| 414,028 | co |
| 13,726 | cp |
| 2,120 | cq |
| 125,758 | cr |
| 19,100 | cs |
| 12,365 | ct |
| 60,552 | cu |
| 5,351 | cv |
| 5,172 | cw |
| 1,391 | cx |
| 39,379 | cy |
| 3,640 | cz |