| Count | Prefix |
|---|---|
| 73 | spc- |
| 27 | spc. |
| 6 | spc1 |
| 4 | spc2 |
| 3 | spc3 |
| 1 | spc4 |
| 3 | spc7 |
| 2 | spc8 |
| 2 | spc9 |
| 162 | spca |
| 19 | spcb |
| 56 | spcc |
| 21 | spcd |
| 28 | spce |
| 20 | spcf |
| 24 | spcg |
| 37 | spch |
| 54 | spci |
| 3 | spcj |
| 13 | spck |
| 39 | spcl |
| 34 | spcm |
| 28 | spcn |
| 126 | spco |
| 39 | spcp |
| 2 | spcq |
| 31 | spcr |
| 53 | spcs |
| 43 | spct |
| 14 | spcu |
| 9 | spcv |
| 17 | spcw |
| 2 | spcx |
| 2 | spcy |
| 4 | spcz |