| Count | Prefix |
|---|---|
| 593 | sp- |
| 32 | sp. |
| 37 | sp0 |
| 56 | sp1 |
| 63 | sp2 |
| 45 | sp3 |
| 34 | sp4 |
| 56 | sp5 |
| 19 | sp6 |
| 12 | sp7 |
| 25 | sp8 |
| 13 | sp9 |
| 29,662 | spa |
| 810 | spb |
| 1,001 | spc |
| 665 | spd |
| 30,501 | spe |
| 465 | spf |
| 319 | spg |
| 1,508 | sph |
| 23,051 | spi |
| 116 | spj |
| 326 | spk |
| 4,306 | spl |
| 513 | spm |
| 268 | spn |
| 32,006 | spo |
| 456 | spp |
| 55 | spq |
| 13,485 | spr |
| 1,067 | sps |
| 426 | spt |
| 1,719 | spu |
| 198 | spv |
| 174 | spw |
| 106 | spx |
| 2,757 | spy |
| 80 | spz |