| Count | Prefix |
|---|---|
| 4,556 | c- |
| 26 | c. |
| 307 | c0 |
| 503 | c1 |
| 2,019 | c2 |
| 847 | c3 |
| 816 | c4 |
| 218 | c5 |
| 169 | c6 |
| 117 | c7 |
| 117 | c8 |
| 142 | c9 |
| 341,593 | ca |
| 10,526 | cb |
| 19,390 | cc |
| 12,111 | cd |
| 80,269 | ce |
| 7,937 | cf |
| 5,791 | cg |
| 241,944 | ch |
| 72,800 | ci |
| 4,044 | cj |
| 3,164 | ck |
| 115,156 | cl |
| 13,437 | cm |
| 17,259 | cn |
| 394,912 | co |
| 12,603 | cp |
| 2,022 | cq |
| 120,453 | cr |
| 17,442 | cs |
| 11,405 | ct |
| 58,467 | cu |
| 4,977 | cv |
| 4,804 | cw |
| 1,304 | cx |
| 37,952 | cy |
| 3,423 | cz |