| Count | Prefix |
|---|---|
| 146 | sps- |
| 29 | sps. |
| 5 | sps1 |
| 3 | sps2 |
| 2 | sps3 |
| 2 | sps4 |
| 2 | sps5 |
| 2 | sps7 |
| 2 | sps8 |
| 1 | sps9 |
| 49 | spsa |
| 15 | spsb |
| 79 | spsc |
| 25 | spsd |
| 65 | spse |
| 28 | spsf |
| 20 | spsg |
| 32 | spsh |
| 63 | spsi |
| 7 | spsj |
| 13 | spsk |
| 28 | spsl |
| 49 | spsm |
| 28 | spsn |
| 43 | spso |
| 63 | spsp |
| 3 | spsq |
| 19 | spsr |
| 95 | spss |
| 68 | spst |
| 28 | spsu |
| 8 | spsv |
| 18 | spsw |
| 1 | spsx |
| 20 | spsy |
| 6 | spsz |