| Count | Prefix |
|---|---|
| 2,551 | u- |
| 29 | u. |
| 73 | u0 |
| 196 | u1 |
| 585 | u2 |
| 144 | u3 |
| 204 | u4 |
| 56 | u5 |
| 51 | u6 |
| 59 | u7 |
| 401 | u8 |
| 53 | u9 |
| 4,624 | ua |
| 6,633 | ub |
| 7,313 | uc |
| 3,623 | ud |
| 2,661 | ue |
| 4,300 | uf |
| 4,047 | ug |
| 2,417 | uh |
| 3,084 | ui |
| 930 | uj |
| 12,900 | uk |
| 18,419 | ul |
| 9,030 | um |
| 85,088 | un |
| 1,685 | uo |
| 18,523 | up |
| 320 | uq |
| 22,033 | ur |
| 48,049 | us |
| 11,909 | ut |
| 1,685 | uu |
| 2,180 | uv |
| 2,902 | uw |
| 1,120 | ux |
| 674 | uy |
| 1,730 | uz |