| Count | Prefix |
|---|---|
| 99 | ef- |
| 36 | ef. |
| 1 | ef0 |
| 13 | ef1 |
| 13 | ef2 |
| 6 | ef3 |
| 6 | ef4 |
| 6 | ef5 |
| 3 | ef6 |
| 2 | ef7 |
| 3 | ef8 |
| 2 | ef9 |
| 1,004 | efa |
| 130 | efb |
| 356 | efc |
| 136 | efd |
| 905 | efe |
| 3,520 | eff |
| 219 | efg |
| 79 | efh |
| 1,472 | efi |
| 28 | efj |
| 83 | efk |
| 655 | efl |
| 187 | efm |
| 133 | efn |
| 888 | efo |
| 160 | efp |
| 19 | efq |
| 721 | efr |
| 372 | efs |
| 442 | eft |
| 475 | efu |
| 36 | efv |
| 70 | efw |
| 91 | efx |
| 42 | efy |
| 27 | efz |