| Count | Prefix |
|---|---|
| 21 | eff- |
| 12 | eff. |
| 3 | eff1 |
| 1 | eff2 |
| 2 | eff3 |
| 1 | eff5 |
| 1 | eff7 |
| 72 | effa |
| 8 | effb |
| 34 | effc |
| 5 | effd |
| 1,740 | effe |
| 6 | efff |
| 7 | effg |
| 2 | effh |
| 1,126 | effi |
| 3 | effj |
| 2 | effk |
| 51 | effl |
| 9 | effm |
| 12 | effn |
| 235 | effo |
| 11 | effp |
| 1 | effq |
| 36 | effr |
| 16 | effs |
| 18 | efft |
| 39 | effu |
| 3 | effv |
| 7 | effw |
| 3 | effx |
| 28 | effy |
| 5 | effz |