| Count | Prefix |
|---|---|
| 2,428 | u- |
| 27 | u. |
| 69 | u0 |
| 189 | u1 |
| 568 | u2 |
| 136 | u3 |
| 193 | u4 |
| 48 | u5 |
| 45 | u6 |
| 56 | u7 |
| 396 | u8 |
| 52 | u9 |
| 4,350 | ua |
| 6,229 | ub |
| 6,778 | uc |
| 3,354 | ud |
| 2,498 | ue |
| 4,026 | uf |
| 3,765 | ug |
| 2,242 | uh |
| 2,881 | ui |
| 879 | uj |
| 12,239 | uk |
| 17,557 | ul |
| 8,408 | um |
| 80,582 | un |
| 1,591 | uo |
| 17,563 | up |
| 300 | uq |
| 20,983 | ur |
| 46,641 | us |
| 11,271 | ut |
| 1,597 | uu |
| 2,013 | uv |
| 2,758 | uw |
| 1,070 | ux |
| 633 | uy |
| 1,536 | uz |